Haha, sweet. A few that people at my residential hall (though most of them you'd probably need a hand with and make sure your brother is out of the house for ages,
- Replacing the lightbulb with a red one (I became known as the red light district for a while...)
When they're out:
- wrapping EVERYTHING (right down to erasers and pencils) in tin foil or newspaper (real annoying for them to undo it all!)
- The most hilarious one (that I jsut want to share, it's a big mission and you'd need help) is that when the guy was out one night they took everything out of his room except the mattress with a single white sheet on it and left a glass of water by it. Everything else (posters, the bed base, all his ski gear, all his furniture) was shifted into one of the bathrooms. Too good!
- Filling the whole room with scrumpled up newspaper
At work one of the girls put a bunch of embarrasing photos on the ceiling. Took ages to notice but got a good reaction
Oh another they did at the hall was moving the whole bed into the hallway.
Ummm, can't think of any others at the mo but yeah.
Oh! Going through and turning everything you can upside down (stereo, furniture, all his books, turning the fully made bed upside down...)