Calvin and Hobbes by Bill Watterson for September 29, 1990
Hobbes: How did you do on your math quiz? Calvin: I flunked it...but only because I ran out of time. The worst part though was that Susie Derkins won our bet on who'd get the better score. I had to pay her 25 cents. But get this! I cheated her! I only gave her three dimes! Ha! Hobbes: I think you'd better study harder. Calvin: Oh, now don't you start on me.