April Fools' Day

April Fools' Day or April Fool's Day is an annual custom in many Western countries on the 1st of April consisting of practical jokes, hoaxes, and pranks. Jokesters often expose their actions by shouting "April Fool[s]!" at the recipient. Mass media can be involved with these pranks, which may be revealed as such the following day. The custom of setting aside a day for playing harmless pranks upon one's neighbor has been relatively common in the world historically.

r/place was a recurring collaborative project and social experiment hosted on the content aggregator site Reddit. Originally launched on April Fools' Day 2017, it has since been repeated again on April Fools' Day 2022 and on July 20, 2023.

1986 film by Fred Walton

1st episode of the 2nd season of South Park

episode of The Simpsons (S4 E18)

1986 film by Peter Litten

2008 film directed by Mitchell Altieri and Phil Flores

experimental meta-game on Reddit.com

4th episode of the 13th season of South Park

thumb|right|Humorina-2007 Humorina (, ) is an annual festival of humor held in Odesa, Ukraine, on and around April Fools' Day (1 April) since 1973. The festival is marked by a large parade in the city center, performances by musicians, comedians, clowns and a large number of fun-dressed people on the streets. These days April Fools' Days' pranks are spread by people and local mass media.

novel by Herman Melville

thumb|kremvax.DEMOS|demos[[.su, a follow-up server in 2007]] Kremvax was originally a fictitious Usenet site at the Kremlin, named like the then large number of Usenet VAXen with names of the form foovax. Kremvax was announced on April 1, 1984, in a posting ostensibly originated there by Soviet leader Konstantin Chernenko. The posting was actually forged by Piet Beertema of CWI (in Amsterdam) as an April Fool's prank—"because the notion that Usenet might ever penetrate the Iron Curtain seemed so totally absurd at the time".

humorous fictional type of computer memory