You can have loads of fun screwing with your roommates bed. There are tons of pranks you can do with a bed that run the gamut. You can do a silly little joke or get serious payback. We will start with one classic that we used on each other as kids. In fact even my best friends in college did this to me monthly and I still thought it was funny every time. I am referring to the Short Sheet prank.
Here is how it works; you sneak into the bedroom and pull the sheet off. Fold the sheet in half so it creates a pocket facing the pillows. Tuck the folded sheet under the bed, Cover the sheet with a comforter so it can't be seen. The victim's feet get trapped in the sheet pocket and they can't get under their covers.
Free Revenge Ideas Upgrades
EVIL PRANK BONUS
The bed can also be wrapped in plastic wrap or tin foil. This is annoying as hell to clean up if you do it well.
GETTING EVEN BONUS
You can also unscrew the legs on the bed frame and just balance the bed on it. When the victim gets in the bed will side off the legs and hit the floor. This is not to dangerous but it should scare the hell out of the victim.
If this is too much work you can stick a few empty cans under the legs and it will cause the bed to drop.
GETTING SERIOUS REVENGE BONUS
This will really piss off your roommate. Take a bucket of water or any other fluid of choice and throw it on the mattress, it will stay damp for days and even start to stink. Your roommate will have to sleep on the couch or floor until it dries.