Work at a place that uses some sort of animal hair to make wigs. Shave your body from neck to toe until you have a good sized container of the nastiest hair imaginable, and dump it in one of the containers they have for the animal hair.

While working at a whipped cream factory, disconnect one of the Nitrous Oxide hoses they use to charge the cans and enjoy the rest of the day.

Work at a factory that makes bleach. Fill tiny ballons full of ammonia and throw them in the bleach vats. The ballons will get popped somewhere along the line...

Become a mechanic and loosen random bolts on people's cars when no one's looking. You can also do this as a janitor in a garage.