I think a thread like this existed once, sorry if it was too recent... I've got school ski trip next week, and I need a whole lot of pranks to pull on my mates. So far we've just decided on putting beef stock in the shower head, and the classic shaving cream and a feather trick. Any good ideas would be awesome.
Hahaha that beef stock one sounds hilarious. Put some shaving cream (or anything gooey and wet) in someone's pillow cover. Meh, I can't think of anything. There was a good video on youtube where someone buttered the floor, and rang the phone so that the guy would come running to it and slip.
[YOUTUBE]MTGLhim0XqA[/YOUTUBE] XD Or you could do the simple and classic "hand in warm water while sleeping" prank.
Suran wrap on a toilet seat. So when they go to the bathroom.. yeah. I've never done it, but I heard from a lot of people that it's hilarious. Kinda gross though, but oh well.