A man and a boy go into a barbershop.

After getting his haircut, the man says, “Now cut the boy’s hair too. I’ll be back soon.”

When he’s finished cutting the boy’s hair, the barber says, “When is your father coming back to pay?”

The boy says, “He’s not my father. He met me in the street and asked if I wanted a free haircut.”

(From Sion Rubi, Intelligent Jokes, 2004.)