In a long line of people waiting for a bank teller1, one guy suddenly started massaging2 the back of the person in front of him.
Surprised, the man in front turned and snarled3, "Just what the hell are you doing?"
"Well," said the guy, "you see, I'm a chiropractor and I could see that you were tense, so I had to massage4 your back. Sometimes I just can't help practicing my art!"
"That's the stupidest thing I've ever heard!" the guy replied. "I'm a lawyer. Do you see me screwing the guy in front of me?"