So this one guy at work, Brian, has been causing random chaos today. I don't know why, but he likes knocking things over on my desk. Today. Like my pencil holder, water bottle, he turned my mouse upside down, etc. For no reason.
So when he went to the washroom today, me and the other programmer ran over to his desk, and mirrored everything. We switched his monitors (physically), his mouse/keyboard, his glass, papers, and pretty much everything on his desk ended up on the opposite side of where it was.
When he came back, he said, "What, you guys dicked with my monitors [slight pause].. and everything else?" -- then we had a hearty laugh as he had to re-re-arrange his stuff.