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What is April Fools’ Day………(from Wiki)

April Fools' Day or All Fools' Day is an annual custom on 1st April consisting of practical jokes and hoaxes. Jokesters often expose their actions by shouting "April Fools!" 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.