This long line of people are queueing up to get served in a shop. Suddenly one bloke starts massaging¹ the person in front's back. The other bloke immediately turns round and says to him, "What the hell do you think you're doing?"

The bloke behind tells him, "Well, I'm a chiropractor and I can't help myself. I can't help practicing my art."

"Are you crazy?"

says the bloke in front, "I'm a lawyer, but do you see me f**king the bloke in front of me?"