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 :)

Most men really care and love their precious car. Even if its an old rusty machine they still hold dear to it. Prank your friend by putting his car for sale

This is a great joke to trick your colleagues and this one is deviously simple. You only need a piece of tape.