There's a doctor, a lawyer and a computer programmer all taking a pee in a public bathroom. They all finish at the same time, and step forward to the wash basins.

The doctor washes his hands, grabs somes paper towels, dries his hands and says to the either two "I use paper towels because hand driers can bred germs."

The lawyer washes his hands and places his hands under the drier and says "I use the drier because of it's precision and less waste."

The computer programmer looks at the other two, gos to the door, turns around and says "I don't piss on my hands".