Calvin and Hobbes by Bill Watterson for November 18, 1992
Mom: Well, your haircut is a big improvement. Calvin: You like what it says on the back of my head? Mom: What what says? Calvin: Didn't the barber shave, "I may have a bad haircut. But you're downright ugly," back there?! Mom: Good heavens, no! Calvin: Ok, Charlie, gimme back that tip!