But don't get caught. - Joke

Okay, this is a funny prank. You take a garbage can and fill it about 3/4 way with water. You lean this up against a random house's door. Knock on the door, run, and hide so you can see it from a distance. When the unsuspecting person opens the door the water will fall into their house flooding it. This is a really funny prank. But don't get caught.