エイプリル・フール

April Fools' Day is an annual celebration on April 1st in many Western countries where people play practical jokes, hoaxes, and pranks on each other, typically revealing the trick by shouting "April Fool[s]!" The tradition of dedicating a day to harmless pranks has been a common practice throughout history and sometimes involves media participation, with the hoaxes often being exposed the next day.

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