As soon as he opened the door they all fell in on him! The Lampoon Image Source Harvard University can boast of several publications, with the Crimson and the Lampoon being two of the oldest.
Funny dormitory prank - bins stacked up to block flat door. If they say 'No', then ask them to put one hand on top of the other and put the glass on top of it. Take a bunch of grapes and put one grape on everything in the fridge, including bottles, cold meat packets, juice cans, beer cans, butter and everything else there is in the middle of the night.
See how people will keep rattling about it all throughout the day.
If it's harmless, than have fun! Consider Your Audience Safe and fun pranking is all about considering your audience.