Boards
I just opened my bedroom door to discover
the doorway has been covered with a web of duct tape, so I know have to crawl out.
This may be because earlier me and a flatmate hid someone else's birthday cake, replacing it's place in the box with a picture of a cake cut out of a newspaper. And then turned everything in another guy's room upside down, including the drawers, chair, etc.
Crazy student pranks are unashamedly stupid and a bit lame, but somehow still make you laugh at the time. See also.. Swapping sugar and salt. Always a bundle of giggles.