H( 682 A app CApril Fool's 米 April Fool's Day is an old custom celebrated every year on the first day of april popular since the 19th century. on that day people play practical jokes and hoaxes on each otherApril Fool’s Day is an old custom celebrated every year on the first day of April. Popular since the 19th century. On that day people play practical jokes and hoaxes on each other