The priest tries to pay for the haircut, but the barber refuses, saying, "You perform God’s work." The next morning the barber finds a dozen bibles at the door to his shop.
A policeman goes to the barber for a haircut, and again the barber refuses payment, saying, "You protect the public." The next morning the barber found a dozen doughnuts at the door to his shop.
A lawyer goes to the barber for a haircut, and again the barber refuses payment, saying, "You serve the justice system."
The next morning the barber found a dozen lawyers waiting for a free haircut.