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 :)

This is a prank anyone can perform as anybody has a tube of toothpaste lying around right?! Put the toothpaste somewhere your victim has to touh! April Fool!

Pick a 'needs to know it all' friend from your group, and send a text about a juicy secret.