Hang up teabags outside someones room. It's excellent to do this to your roommates for an extended period of time, eventually they will lose it! You'll see :)

Aprils Fools' Day prank: Ripped pants. When you are near your mom, drop the pen to the ground. As you reach down to grab it, it seem you rip your pants.

This prank is funny when you use fake poop. Put a cover over it and tell your kid or roommate there is a bird under there. You have to be quick to catch it.