Calvin and Hobbes by Bill Watterson for September 21, 1990
Susie Derkins: Don't try to copy my answers this time, Calvin, or I'll tell. Calvin: Ha! Who needs your answers?! I'll bet I get a better score than you do. Susie Derkins: you?! That'll be the day! Calvin: I'll bet you 25 cents I get a higher grade. Susie Derkins: You're on. Calvin: You might as well give me the quarter now and save yourself the humiliation later! Susie Derkins: Maybe you'd like to increase the wager, Mr. Bigmouth. Calvin: Yeah! Let's double it and make it 35 cents!