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Reference.org
April Fools' Day
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<p>April Fools' Day or April Fool's Day (rarely called All Fools' Day) is an annual custom on the 1st of April consisting of <a href="/facts/Practical_joke/VHohx9le">practical jokes</a> and <a href="/facts/Hoax/AsSvg6Tp">hoaxes</a>. 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 neighbour has been relatively common in the world historically. </p>