• Secretly become pregnant and wear large clothing for several months or simply disappear to a writer’s retreat.  On April 1, arrive home and immediately give birth.
  • Work for a bank until you are trusted enough to handle the money that goes into stocking an ATM.  Write “There’s an ostrich behind you!” on every bill you stock in the ATM the night before April 1.  Also, raise and train an ostrich to trust you and to squawk “April Fools!”  When you go to the ATM with your friend, they’ll see the message, scoff at the ridiculousness of it, then turn around and see you riding a talking ostrich.
  • Create a fake Twitter account for your friend which, through viral means, becomes insanely popular.  Use this as a launching point for registering your friend as a candidate for city council and schedule a speech and rally on April 1 with printouts of his face.  Joke about how it’s funny that your friend shares the same name as a famous politician and convince him to go to the rally.  When he arrives, just before he gets cheered onto the stage, yell “April Fools!”
  • Plant an assortment of flowers in your friend’s front lawn that, when blooming, spell “April Fools!”
  • Have identical twins, but raise them in separate environments until they are teenagers.  Then, arrange for them go out one night to the same place and to go to adjoining bathrooms at the same time.  Install a “fake” mirror between the bathrooms and watch as they try to figure out why their reflection is being all weird.
  • Invest in the field of robotics until research has progressed to a stage where you can get a fully functioning robot hand that looks and feels like human skin.  Replace your hand with the robot hand and go to shake your friend’s hand.  When they shake, send a small shock through your hand, then use the built-in flamethrower to light their pants on fire.  Don’t forget to say “April Fools!”
  • Become the charismatic leader of a extremist group that wins popular approval and a government position through democratic means.  Ascend in power and over time, transform the country into a dystopian fascist state.  Arrange to have a friend seized and executed on April 1, but as they put on the blindfold, it says “April Fools!” on the inside of it.