This one works great for the dorms cus the rooms are so close to each other.
Neighbor Wars
1. Find two unsuspecting neighbors
2. Get a length of rope and tie their doorknobs together. Leave about a foot and a half of slack.
3. Loudly pound on the two doors and prepare the video camera.
One will try to open the door and it won't open all the way. The other will try to open theirs and end up pulling the rope and slamming the other door shut. That'll really piss off the other person, thinking someone is pulling on the door knob, and they'll jerk back really hard on the door slamming the other persons door. It creates an awesomely epic battle of tug-o-war between two really pissed off neighbors.
Fun to watch over and over.