ULPT How i can punish this man ?

I have a question: I’m a culinary apprentice and my contract ends on Friday. There’s one apprentice I can’t stand—the guy is insolent, thinks he’s better than everyone else, and on top of that, never does any work. I’m looking for a way to punish him for being a total asshole. I thought about putting his clothes in the freezer, but my buddy and I would get absolutely reamed by the sous-chef. Any ideas for a crime with no culprit? 😂