Mind Your Head

Bus driver: Please mind your head.

Passenger: Excuse me? Do you mind?

Bus driver: Do I mind what?

Passenger: Minding your own business?

Bus driver: I'm just asking you to mind your head. And, yes, I do mind you asking me to mind my own business.

Passenger: And I, too, mind you not minding your own business by asking me to mind my head.

Bus driver: Never mind.

Passenger: Why should I mind? I don't mind.

Other passengers: SHUDDUP!