Granted it's an old story, but one year I took the pins out of the hinges on the bedroom door of my stepsons' room....the first one up got a face-full of door when he tried to leave the room.

But from my 'corporate' days, I put together a piece that looked like a newspaper article that had been faxed a few times....it told how the phone company needed everyone to leave their phone off the hook between 2 and 4 pm that afternoon, so they could force air through the phone lines 'to blow out the dust'. I sent the 'article' to several remote office locations, and managed to find a reason to call them between the designated hours.

Four of seven phones were off the hook.