I know this isn't what you're looking for but...
My friend left his guitar at my place for a week or two. He's a major practical joker, so I re-wired his guitar for him. I changed the pickup selector switch to work in different positions (neck works in the mid spot, bridge works in neck spot, down setting is kill, etc...)
I also switched his volume and tone pots, and removed the grounding to the bridge.
Am I evil?
He didn't even notice for a week after he remembered he left it at my house.