You fools! If you're not a big corporation turning a prank into a marketing ploy, it's unlikely you'll have put much, if any, time, thought or meticulous planning into April Fool's Day. The closest I've ever come to being pranked was French style, ie. not at all. In France, instead of April Fool's Day, there exists Poisson D'Avril or April Fish. That's right, children stick paper fish to the backs of adults just for lols, running off shouting POISSON D'AVRILLLLL. Happy April Fish Day!
Back in 1989, Richy Richard Branson decided it would be hilarious to create a hot air balloon disguised as a UFO and land it in Hyde Park on 1st April. It would indeed have been hilarious if it had all gone to plan. Unfortunately the wind was blowing in the wrong direction and the UFO landed in a field in Surrey, much to the confusion of the locals. A policeman who was given the task of approaching the balloon, later confessed that he had "never been so scared in 20 years of being a policeman."