Calvin and Hobbes by Bill Watterson for November 21, 1985
Miss Wormwood: Show and tell is over, Calvin. Please put your "tiger" in your locker. Calvin: In my locker?! He'll suffocate! Miss Wormwood: Well, at least put him under your chair. Calvin: Whew! That was a close one! Hobbes: I'll say! Calvin: Seven plus three. Hobbes: Seventy-three.