I recently saw an article about a guy who took his buddies truck and wired up the horn so every time he stepped on the brake the horn blew. What practical jokes have you pulled. I used to work with a guy many years ago who would go in the fridge at work and go through everybody's lunches. So we decided to get even by taking a nice big cupcake and melting xlax on it in with the icing and locking the bathroom door,needles to say he never bothered our food again.
You can't dispel Ignorance if you retain Arrogance!