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 your 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.
Another one is to get a remote that works on the main t.v. and mute it, turn up the volume, change the channel, and turn off the power do it when they are watching their favorite show.
Okay- here's one for revenge. It would be best to do this somewhere where the person you are pranking cannot get another pair of clothes-like camping for example. What you do is get a container of Bleach and put a bunch of hair in it and leave it there over night. Next morning, drain it and chop the hair real fine... and it becomes itching powder!!! Put it all over the other person's clothes