This practical joke is plain and simple, thus perfect for rookie April Foolers. Put some tape under the water tap. When they turn it on, water squirts everywhere.

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 :)

Many people use their smartphone all the time, so one of the best ways to mess with them on April Fools' Day is to mess with their smartphone.