Elevator Excrement

For this prank it will require at least three people and you will need to seek out a 

corporation or high rise story building with at least 100 or more floors where riding in an elevator is an option. Your three buddies walk into an elevator and make sure that they are the only ones in there and wait until the door closes. Once it closes you hit the button to go to the top floor allowing you and your buddies enough time, to use the elevator floor as a temporary restroom. Once you are finished you wait until the elevator reaches the top floor and walk out casually, as more people walk into the elevator for the fun ride down. 

- The Crazed Anarchist ;)