April Fools' Day or All Fools' Day (sometimes written, incorrectly, with the apostrophe before the ''s'' rather than after), though not a holiday in its own right, is a notable day celebrated in many countries on April 1. The day is marked by the commission of hoaxes and other practical jokes of varying sophistication on friends and neighbors, or sending them on fools' errands, the aim of which is to embarrass the gullible. In some countries, April Fools' jokes (also called "April Fools") are only made before midday. It is widely celebrated on the Internet.
The origin of this custom has been much disputed. Many theories have been suggested.
What seems certain is that it is in some way or other a relic of those once universal festivities held at the vernal equinox, which, beginning on old New Years day, the 25th of March, ended on the 1st of April.
It has been suggested that Europe derived its April-fooling from the French. France was one of the first nations to make January 1 officially New Year's Day (which was already celebrated by many), by decree of Charles IX. This was in 1564, even before the adoption of the Gregorian calendar. Thus the New Year's gifts and visits of felicitation which had been the feature of the 1st of April became associated with the first day of January, and those who disliked or did not hear about the change were fair game for those wits who amused themselves by sending mock presents and paying calls of pretended ceremony on the 1st of April. French and Dutch references from 1508 and 1539 respectively describe April Fools' Day jokes and the custom of making them on the first of April.
Though the 1st of April appears to have been anciently observed in Great Britain as a general festival, it was apparently not until the beginning of the 18th century that the making of April-fools was a common custom. In Scotland the custom was known as "hunting the gowk," ''i.e.'' the cuckoo, and April-fools were "April-gowks," the cuckoo being, as it is in most lands, a term of contempt. In France the person fooled is known as ''poisson d'avril''. This has been explained from the association of ideas arising from the fact that in April the sun quits the zodiacal sign of the fish. A far more natural explanation would seem to be that the April fish would be a young fish and therefore easily caught.
The Dutch celebrate the 1st of April for other reasons. In 1572, the Netherlands were ruled by Spain's King Phillip II. Roaming the region were Dutch rebels who called themselves Geuzen, after the French "gueux", meaning beggars. On April 1, 1572, the Geuzen seized the small coastal town of Den Briel. This event was also the start of the general civil rising against the Spanish in other cities in the Netherlands. Fernando Ălvarez de Toledo, General Alva of the Spanish army could not prevent the uprising. Bril is the Dutch word for glasses, so on April 1, 1572, "Alva lost his glasses". Dutch people find this joke so hilarious they still commemorate the first of April.
The French traditionally celebrated this holiday by placing a dead fish on the back of friends. Today the fish is substituted by a paper cut out.
Chaucer's story, the Nun's Priest's Tale, written c.1400, takes place on March 32; that is, April 1. Chanticleer and the Fox is a story of two fools.
Many media organizations have either unwittingly or deliberately propagated hoaxes on April Fools' Day. Even normally serious news media consider April Fools' Day hoaxes fair game and spotting them has become an annual pastime. A number of serious journals would publish hoax articles in their April volumes. The advent of the Internet as a worldwide communications medium has also assisted the pranksters in their work.
Alabama Changes the Value of Pi: The April 1998 newsletter of New Mexicans for Science and Reason contained an article claiming that the Alabama Legislature had voted to change the value of the mathematical constant pi to the "Biblical value" of 3.0. This claim originally appeared as a news story in the 1961 sci-fi classic "Stranger in a Strange Land" by Robert A. Heinlein.
Spaghetti trees: The BBC television programme ''Panorama'' ran a famous hoax in 1957, showing the Swiss harvesting spaghetti from trees. A large number of people contacted the BBC wanting to know how to cultivate their own spaghetti trees.
South Park: April 1st was advertised as being the premiere of the show's second season—and also the resolution of a cliffhanger where Eric Cartman was about to discover the identity of his father. Fans spent weeks speculating on the father's identity, but when they tuned in to the episode, they were instead treated to a half-hour of Terrance and Phillip fart jokes. The true resolution to the cliffhanger aired several weeks later. The show's creators, Trey Parker and Matt Stone claim during the DVD introduction to this episode that they received death threats over pulling the prank, although there were not any police reports to prove this.
Left Handed Whoppers: In 1998, Burger King ran an ad in USA Today, saying that people could get a Whopper for left-handed people whose condiments were designed to drip out the right side.
Taco Liberty Bell: In 1996, Taco Bell took out a full-page advertisement in ''The New York Times'' announcing that they had purchased the Liberty Bell to "reduce the country's debt" and renamed it the "Taco Liberty Bell." When asked about the sale, White House press secretary Mike McCurry replied with tongue-in-cheek that the Lincoln Memorial had also been sold and would henceforth be known as the Ford Lincoln Mercury Memorial.
Lies to Get You Out of the House: In 1985, the ''L.A. Weekly'' printed an entire page of fake things to do on April Fools day, by which hundreds of people were fooled.
Kremvax: In 1984, in one of the earliest on-line hoaxes, a message was circulated that Usenet had been opened to users in the Soviet Union.
San Serriffe: ''The Guardian'' printed a supplement in 1977 praising this fictional resort, its two main islands (Upper Caisse and Lower Caisse), its capital (Bodoni), and its leader (General Pica). Intrigued readers were later disappointed to learn that San Serriffe (sans serif) did not exist except as references to typeface terminology.
FBI Crackdowns on On-line File Sharing of Music: Such announcements on April Fools Day have become common.
Metric time: Repeated several times in various countries, this hoax involves claiming that the time system will be changed to one in which units of time are based on powers of 10.
Smell-o-vision: In 1965, the BBC purported to conduct a trial of a new technology allowing the transmission of odor over the airwaves to all viewers. Many viewers reportedly contacted the BBC to report the trial's success. This hoax was also conducted by the Seven Network in Australia in 2005.
Tower of Pisa: The Dutch television news reported once in the 1950s that the Tower of Pisa had fallen. Many shocked people contacted the station.
Wrapping Televisions in Foil: In another year, the Dutch television news reported that the government had new technology to detect unlicensed televisions (in many European countries, television license fees fund public broadcasting), but that wrapping a television in aluminium foil could prevent its detection.
Breast Exams by Satellite: In the 1990s, Portuguese national television network RTP announced the Ministry of Health would perform free breast exams by satellite, causing thousands of women to go out topless.
Sidd Finch: George Plimpton wrote a 1985 article in ''Sports Illustrated'' about a New York Mets prospect who could throw a 168 mph fastball with pinpoint accuracy. This kid, known as "Barefoot" Sidd[hartha] Finch, reportedly learned to pitch in a Buddhist monastery. The first letter of each line in the opening paragraph spelled out the fact of its being an April Fool joke.
Assassination of Bill Gates: Many Chinese and South Korean websites claimed that CNN reported Bill Gates, the founder of Microsoft, was assassinated.
Write Only Memory: Signetics advertised Write Only Memory IC databooks in 1972 through the late 1970s.
"Wheel of Fortune''/''Jeopardy!'' Double Switch: In 1997, Pat Sajak, the host of ''Wheel of Fortune'', traded hosting duties with ''Jeopardy!'s'' Alex Trebek for one show. In addition to Sajak hosting ''Jeopardy!'', he and co-host Vanna White appeared as contestants on the episode of ''Wheel'' hosted by Trebek. White's position was filled by Sajak's wife Leslie.
Comic strip switcheroo: Cartoonists of popularly syndicated comic strips draw each others' strips. In some cases, the artist draws characters in the other strip's milieu, while in others, the artist draws in characters from other visiting characters from his own. Cartoonists have done this sort of "switcheroo" for several years. The 1997 switch was particularly widespread.
''The Trouble with Tracy'': In 2003, The Comedy Network in Canada announced that it would produce and air a remake of the 1970s Canadian sitcom ''The Trouble with Tracy.'' The original series is widely considered to be one of the worst sitcoms ever produced. Several media outlets fell for the hoax.
National Television Station (TVM) in Malta: In 1995, TVM announced the discovery of a new underground prehistoric temple with a mummy. Another year, TVM announced that Malta would adopt the European continent convention of driving on the right-hand side of the road.
Free wine for all:The Norwegian newspaper "Bergens Tidende" announced in 1987 that the state's alcohol monopoly had 10,000 litres of illegally smuggled wine that had been confiscated. The inhabitants of Bergen were invited to the main store in town to receive their share of the goods, rather than to spill good wine down the drain. That morning staff were met by about 200 men & women with bottles, buckets, and other suitable vessels for carrying the prized goods. Legislation in Norway causes alcohol to be relatively expensive and have limited availability.
Rain drop power: On April 1st 2006 Norwegian media had a one-page story concerning "rain drop power", which could replace oil as a primary energy source. One could write to the energy company BKK in Bergen in order to be a volunteer and receive the power generated for free.
The Canadian news site bourque.org announced in 2002 that Finance Minister Paul Martin had resigned "in order to breed prize Charolais cattle and handsome Fawn Runner ducks."
SARS Infects Hong Kong: In 2003 during the time when Hong Kong is seriously hit by SARS, it was rumored that many people in Hong Kong had become infected with SARS and become uncontrolled, that all immigration ports would be closed to quarantine the region, and that Tung Chee Hwa, the Chief Executive of Hong Kong at that time, had resigned. Hong Kong supermarkets were immediately overwhelmed by panicked shoppers. The Hong Kong government held a press conference to deny the rumor. The rumor, which was intended as an April Fools' prank, was started by a student by imitating the design of Ming Pao newspaper website. He was charged for this incident.
China Decapitates Taiwan: In 2005, an undergraduate nicknamed SkyMirage, who was well-known in Taiwan for his humor, fabricated a series of news that China's airforce was bombarding Office of President, Taiwan.
Water on Mars: In 2005 a news story was posted on the official NASA website purporting to have pictures of water on Mars. The picture actually was just a picture of a glass of water on a Mars Candy Bar.
Annual BMW Innovations: see a new "cutting-edge invention" by BMW advertised across British newspapers every year, examples including:
-Warning against counterfeit BMWs: the blue and white parts of the logo were reversed
-The ''"Toot and Calm Horn"'' (after Tutankhamun), which calms rather than aggravates other drivers, so reducing the     risk of road rage
-MINI cars being used in upcoming space missions to Mars
-''IDS ("Insect Deflector Screen") Technology'' - using elastic solutions to bounce insects off the windscreen as you drive
-''SHEF ("Satellite Hypersensitive Electromagnetic Foodration") Technology'', which sees the car's GPS systems     synchronise with home appliances to perfectly cook a meal for the instant you return home
-''Marque-Wiper'' - mini-wipers for each exterior "BMW" logo coming as standard on all future models
-''"Uninventing the wheel"'' to counter the "EU ban" on right-hand drive cars, and
-''Zoom Impression Pixels ("ZIP") to counter new ''"Slow Cameras"''
Sheng Long: Electronic Gaming Monthly's infamous hoax of a secret character in Street Fighter II.
There have been several other EGM pranks that readers have fallen into. Among them: claiming that some Street Fighter II characters possessed unlisted special moves, including Chun-Li hurling her bracelets at an opponent, Sega mascots Sonic and Tails appearing as playable characters in Super Smash Bros. Melee, and the release of a graphically-remade The Legend of Zelda: The Wind Waker as a preorder bonus. All such pranks have been met with praise and equal hatred from its readers, as can be seen in the "April Fools" letters section in the May issue.
EGM tried the Sheng Long hoax again with Street Fighter III and once again got some people to believe it.
Coldplay to back the Tories - On April 1 2006 the UK Guardian journalist "Olaf Priol" claimed that Chris Martin of rock band Coldplay had decided to publicly support the Conservative Party leader David Cameron due to his disillusionment with current New Labour prime minister Tony Blair, even going so far as to produce a fake song, "Talk to David", that could be downloaded via the Guardian website. Despite being an obvious hoax, the Labour Party's Media Monitoring Unit were concerned enough to circulate the story throughout "most of the government".
By radio stations
Death of a mayor: In 1998, local WAAF shock jocks Opie and Anthony reported that Boston mayor Thomas Menino had been killed in a car accident. Menino happened to be on a flight at the time, lending truth to the prank as he could not be reached. The rumor spread quickly across the city, eventually causing news stations to issue alerts denying the hoax. The pair were fired shortly thereafter. After which they became famous when their show became syndicated.
Free concert: Radio station 98.1 KISS in Chattanooga, Tennessee falsely announced in 2003 that rapper Eminem would be doing a free show in a discount store parking lot. Several police were needed to deal with traffic gridlock and enraged listeners who threatened to harm the DJs responsible. Both DJs were later jailed for creating a public nuisance. Also, radio station WAAF 107.3 in Boston announced that Pearl Jam was having a free concert in a fictional city in New Hampshire. A gas station in New Hampshire reported that several streams of car drivers stopped in asking for directions to the fictional town.
New format: Radio station KFOG in San Francisco, claiming new corporate ownership, switched to a new format - the best 15 seconds of every song. All morning they mixed in false calls from perky listeners calling with compliments. This hoax can also be considered a parody of late 1990s media consolidations.
New format: in 1998, radio station KITS in San Francisco played gay-themed songs and changed its call letters to "KGAY" for an hour.
New format: in 2006, radio station KOSY in Salt Lake City, Utah, switched to a new format of year-round Christmas music.
New format: On March 29th, 2006 95.5 WBRU, an alternative rock station in Providence, RI announced that they were being bought out, and would cease operations by 5 p.m. on Friday, March 31st. Soon after WBRU went off the air, Buddy FM, a parody of the Jack FM radio format, began broadcasting random pop and techno music along with occasional pre-recorded station bumps until a mock takeover was staged by WBRU DJs at 12:16 p.m. on April 1st. The prank continued in some form until roughly 4:09:37 p.m., April 1st.
Sydney Olympics: Australian radio station Triple J breakfast show co-host Adam Spencer announced in 1999 that he had a journalist on the line at the site of a secret IOC meeting and that Sydney had lost the 2000 Summer Olympics. New South Wales Premier Bob Carr was also in on the joke. Channel 9's ''Today Show'' picked up the story.
Defying gravity: In 1976, British astronomer Sir Patrick Moore told listeners of BBC Radio 2 that unique alignment of two planets would result in an upward gravitational pull making people lighter at precisely 9:47 a.m. that day. He invited his audience to jump in the air and experience "a strange floating sensation." Dozens of listeners phoned in to say the experiment had worked.
Shuttle landing: In 1993, a San Diego radio station fooled many listeners into believing that the space shuttle had been diverted from Edwards Air Force Base and was about to make an emergency landing at a small local airport.
Cancellation of the Howard Stern Show: The April 1st, 2004 show started off with an announcement by the station manager stating that due to increased pressure from the FCC, Viacom had cancelled the Howard Stern Show. The station played pop songs until 7:00 am, when Stern came back on.
Change of drinking age: On the Gold Coast, Australia's biggest tourist destination (particularly amongst schoolies), radio station Sea FM announced the drinking age would be changed from 18 to 21. This left a huge number of under-21s angry and frustrated, and incited protests. It was later announced at the Sea FM dance party that it was a hoax.
Second Audio Program (SAP): In 2005, Micky Dolenz told listeners WCBS-FM was broadcasting in foreign languages, and they could make use of the SAP Language control. Callers to the radio station were told that if you didn't have an SAP button, then twist the antenna a bit.
End of the Lockout: In 2005, on Vancouver's 99.3 the fox, they announced at around 7:30 in the morning that the NHL lockout was over and a new Collective Bargaining Agreement had been reached. Half an hour later they admitted the joke and then proceeded to play numerous phonecalls from disgruntled listeners for another hour.
By television stations
In April 2006, the "Best Damn Sports Show Period" staged a fight between Tom Arnold and Michael Strahan. On Friday March 31st the show went off the air as Tom Arnold was wrestling NY Giant's defensive end Michael Strahan to the ground over comments Tom made in a tell-all book. Strahan pretended to be very hurt by screaming and clutching his shoulder as the cameras cut to black. It fooled cast members Rodney Peete and Rob Dibble enough to have them interject in the fight. Rodney Peete went so far as to give Tom rabbit punches while he broke up what he thought was a real fight. It also worked enough to fool the popular internet site "deadspin.com" into reporting it as a real event.
Swiss network TSR (Television Suisse Romande), broadcast a totally ridiculous report every year, usually at the end of the 19.30 news. For example, in 2005, they reported that instead of being helicoptered out when a person is injured while skiing, they are parachuted down the mountain. In 2006, it was that the town of Fribourg was planning to make people to release their handbrakes in designated areas, so that if parking spaces were too tight, all people would have to do was to call for the police and they would push the car.
In 2006, the night-time channel Adult Swim significantly changed its programming. InuYasha was replaced by the 1980s cartoon Karate Kommandos starring Chuck Norris, while Neon Genesis Evangelion was replaced by Boo Boo Runs Wild and Cowboy Bebop was replaced by the Mr. T animated series. Full Metal Alchemist and Ghost in the Shell: S.A.C. 2nd GIG had their episodes edited so characters farted throughout the show, although they showed an unedited version of the Ghost in the Shell episode later in the night. And in one of its elaborate pranks, Adult Swim aired 8 episodes of Saved by the Bell over a 2 week period. There was no prank in 2005 because it fell on a Friday, but in 2004, mustaches were drawn on characters during the shows.
In 1998 instead of ending a season 1 cliffhanger, which the fans waited 4 weeks to see, the creaters of South Park played an irrelevant episode. ( See Terrance and Phillip in Not Without My Anus )
In 1989, Seattle area TV program ''Almost Live!'' set up a phony broadcast room and dressed up actors as TV anchors to pull an April Fools' joke explaining that the Space Needle had collapsed ina windstorm.
After 50 years, the 1957 BBC report of the purported bumper annual spaghetti harvest (see Spaghetti trees above) remains one of the most successful TV hoaxes of all time.
The BBC's Saturday lunchtime show ''Football Focus'' broadcast a piece centred on the upcoming change of the size of goals. Using West Ham United manager, Harry Redknapp, the report claimed that the size of the goals would increase by two feet in height and four feet in length. Redknapp was being 'interviewed' on the training ground where his goalkeepers were getting to grips with bigger goals. They told the truth on the following week's show, where outtakes of Redknapp messing up his lines were also shown. The BBC's Grandstand sports magazine programme once featured a dispute between two production staff that turned into a fight, while the presenter continued oblivious to the scuffle behind him.
In 1998, the Channel 4 morning show ''The Big Breakfast'' got into trouble with various authorities for pulling an April Fools stunt showing video footage of the Millennium Dome on fire.
The 1977 British documentary ''Alternative 3'' was originally intended as an April Fools' Day hoax and the date of April 1, 1977 is specifically given in the programme's credits. This documentary detailed the discovery of a major cover-up involving the American and Soviet Space Agencies, who had been collaborating on plans to make the moon and Mars habitable in the event of a terminal environmental catastrophe on Earth. The programme led to a large number of conspiracy theories.
In 1979 the BBC programme ''That's Life!'', which often featured talented pets, fooled many viewers with its story about an Old English sheepdog that could drive a car.
In 1991, during the time block of the student comedy show Coo-Coo, the Bulgarian National Television airs breaking news that '...the situation in the nuclear power plant of Kolzoduj is fully under control.' This brings back memories of the communist censorship during the reporting of the Chernobyl disaster half a decade earlier. 90% of the viewers are convinced that reactor No.4 in Kozloduj has exploded. The authors of the comedy show are later accused of manipulating the public in order to destabilize the Bulgarian government.
NESN, a New England sports network, announced that Tom Brady, the quarterback for the New England Patriots, had resigned, and that he would become a Pitcher for the Boston Red Sox.
By Game Shows
As part of an April Fools' joke on April 1, 1997, Alex Trebek and Pat Sajak switched hosting duties. Pat hosted Jeopardy! that day and Alex hosted Wheel of Fortune where Sajak and Vanna White played as contestants. Jeopardy! announcer Johnny Gilbert did double duties that day.
''The Price is Right'' notoriously gave away April Fools' day themed showcases in the 1980s featuring assortments of gag prizes (such as trips to made up locations) or by staging the entire showcase to fall apart. However, once the deception was revealed, the real showcase the contestant was to bid on usually consisted of extravagant prizes, such as two new cars.
April Fools' Day RFC
RISKS Digest publishes a special April 1st issue.
Jennifer Government: NationStates runs an annual hoax on April 1st. In 2004, the hoax was that there was a population bug and all nations' populations would be reset to 5 million people. In 2005, there was a message (supposedly from the United States Department of Defense) that NationStates was illegal by US law. In 2006, 'NationDates' was created. It used a quiz similar to the one taken at the sign-up page, and matched that nation with a random country in the same region.
Neopets has performed numerous April Fools' jokes, including releasing 50 new pets, abolishing "NeoPoints" completely, and charging Neopoints to use the site.
Homestar Runner creators, The Brothers Chaps, now regularly put up April Fools' jokes, such as the most recent one in which the entire site is flipped upside-down.
Throughout production of the 2005 remake of ''King Kong'', director Peter Jackson produced behind-the-scenes featurettes for the Internet providing updates on the project. On April 1, 2005, Jackson (aided by cast members, crew members, and even a studio representative) announced that ''King Kong'' would be followed by a sequel, ''Son of Kong'', which would see Kong's offspring battling Nazis after being equipped with shoulder mounted machine guns. Jackson went so far as to have faux production drawings and computer animation test footage created for the film. The joke report was later included on the ''Peter Jackson's Production Diaries'' DVD set but was not identified as an April Fools' joke; it is incumbent upon the viewer to notice the date of the installment.
April 1, 2006 - BitTorrent website TokyoToshokan's main page showed a United States Supreme Court order, saying that it will be shutdown due to illegal data trafficking. But careful people will notice a link to the actual page, saying "TokyoToshokan's April Fools you idiot" in white text, rendering it invisible. Also, the website eAthena, a site distributing potentially illegal server software for the MMORPG Ragnarok Online, modified its home page, claiming that the Federal Bureau of Investigation had shut down its website and IP addresses were being logged. Within seconds, the user was redirected to the regular forums page.
April 1, 2000 - Soviet website made a joke about a possible fake shuttle named Baikal.
April 1, 2006 - The webmasters of MuggleNet (Emerson Spartz) and The Leaky Cauldron (Melissa Anelli) temporarily shut down their sites to redirect to one called ''The Leaky Mug''. The site claimed that the two webmasters were to marry.
April 1, 2006 - The homepage of Stick Figure Death Theatre was changed to that of 'San Francisco Dance Troupe'. Clicking any links would redirect you back to the real website.
April 1, 2006 - Gamefaqs.com had their homepage changed to a page saying:We have closed this site because of the new law that says 'game cheats are illegal. The producers work for months thinking out scripts for game and you ruin them with cheats. WE DO NOT ALLOW THIS ANYMORE!!! After 15 seconds you were directed to the homepage and you could see a text at the bottom of the page saying that it's a hoax and you are directed to our page after 15 secs.'
Side-effects of April Fools' Day
The frequency of April Fool hoaxes sometimes affect people to doubt actual, legitimate news stories release on that date.
The April 1 Aleutian Island earthquake tsunami that killed 165 people on Hawaii and Alaska resulted in the creation of a tsunami warning system (specifically The Pacific Tsunami Warning Center), established in 1949 for Pacific Ocean area countries. The tsunami is known in Hawaii as the April Fools Day Tsunami due to people thinking the warnings were an April Fools prank.
Gmail's April 2004 launch was widely believed to be a prank, as Google was known to include joke pages on their website, until that point.
The 2005 death of comedian Mitch Hedberg was originally dismissed as an April Fools' Joke. The comedian's March 29, 2005 death was announced on April 1, 2005.
''Demashita! Powerpuff Girls Z'' was announced for production by Aniplex, Cartoon Network, and Toei Animation in 2005 and was originally discredited, but turned out to be true when poster art and clips from the series were revealed days later.
Other prank days in the world
The April 1 tradition in France includes poisson d'avril (literally "April's fish"), attempting to attach a paper fish to the victim's back without being noticed. This is also widespread in other nations, such as Italy (where the term "April's fish" is also used to refer to any jokes done during the day).
In Spanish-speaking countries, similar pranks are practiced on December 28, the Massacre of the Day of the Holy Innocents. This custom also exists in certain areas of Belgium, including the province of Antwerp. Flemish tradition is for children to lock out their parents or teachers, only letting them in if they promise to bring treats the same evening or the next day.
In Iran, people play jokes on each other on April 3, the 13th day of the Persian calendar new year (Norouz). This day is called "Sizdah bedar" (Outdoor thirteen). It is believed that people should go out on this date in order to escape the bad luck of number 13 (number) As lucky, unlucky, or 13.
In the United Kingdom, Canada, Australia and New Zealand the April 1 tradition exists, however it is accepted that if somebody pulls an April Fools' Trick after 12pm (mid-day), then the person pulling the trick is actually considered the fool (this caveat may also exist in other countries).
In Denmark the 1st of May is known as "Maj-kat", meaning quite simply "May-cat", and is identical to April Fools' day, though Danes also celebrate April Fools' day ("aprilsnar").
Some Jewish communities have a traditional event called a Purim spiel, which is similar in many ways to April Fools' Day. Fake newspaper articles are common.