I played this prank on my supervisor.  We joke around a lot and the #1 rule of thumb is, if you get up and walk away, your cubical is fair game.  Over the years I've taped all her file drawers shut.  Taped everything on the top of her desk to her desk.  Switched her calendar out for an old one.  Stuck googly eyes on everything in her cubical.  Hidden her chair.  Chained all the paperclips in her paperclip cup together.  I can't tell you how many times I've set her clock back, or forward.  I've even resorted to the whoopee cushion.  I'm nearly running out of ideas but managed to come up with this one while working on a do's and don'ts list for what I can eat after my surgery.

Trust me, she's gotten me back plenty, and has made lots of jokes about the bag I'm going to be wearing after my surgery.  She deserves this one :)