When I worked at Lexus, we had a greeter up front and he was always in the back trying to be one of the guys. One day he started screwing around with our on-the-car brake lathe and broke it. Needless to say, all the techs were pissed at him so I decided to get him back. I put some brake rotor shavings in a brake cleaner cap and mixed in some battery acid and voila, a really nasty stink bomb. I hid this concoction under a file cabinet in his office and he tore everything out of there trying to find the source of the smell and still couldn't find it! Every time he tried going into his office, he ran out gagging. It smelled so bad it actually burned your nose. Guess that will teach him to mess with us.