April Fool's Day is an annual custom on 1 April consisting of practical jokes and hoaxes. Jokesters often expose their actions by shouting "April Fools!" at the recipient. Mass media can be involved in these pranks, which may be revealed as such the following day.
 
Confession - Back when I was a young teen, I wound a rubber band on the kitchen hose sprayer so when you turned on the faucet it sprayed.  I thought it was pretty funny, but my mom didn’t think so!!  She got back at me the next year when she fixed me French toast for breakfast but had wrapped the bread in gauze so I couldn’t cut through it  What April Fool prank have you done?