What are some funny pranks to do on a roommate?

Some funny pranks to do to a college roommate would be putting saran wrap on a toilet seat. Another funny prank is tying a fishing line and tying a mentos to the inside of a diet cola cap so when a roommate opens the cap, the mentos drops making the soda have a violent eruption. Another prank would be moving all of a roommates furniture to another room.