One of the great roommate pranks of all time is where you subscribe your roommate unknowingly to a bunch of random junk mail. The more embarrassing, the better. It makes their life a mini-hell just trying to cancel all those things, plus you can have endless fun busting their balls for having a subscription to Canoe Weekly.
It totally backfired on this guy, though. He used all those magazines to redecorate his roommate’s room when he was out of town. It’s payback at its very best.