My friend had a fat coworker that used to mess with his things.  He told the grease guzzler to stop, but he wouldn't.  So he got a joke item for his desk that would electrocute anyone that touched it.  Nothing dangerous, but enough to hurt like hell.  Sure enough, the human wrecking ball picked up the item, got shocked so badly that he yelped and almost lost his footing.  It was like a pig running into the electric fence that keeps it in the pen.  He was pissed.  As a bonus, the Twinkie typhoon wouldn't even speak to my friend for a week.