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 :)

Disney is known as an innovater of the themepark world. And now they told the costumers they have a plan to bring the people closer to Pluto.

This one is great to prank your colleagues who work on a computer during April Fools' Day. Switch their computer screen upside down during a break.