Calvin and Hobbes by Bill Watterson for November 17, 1986
Susie: Do you have your line memorized for the nutrition play, Calvin? Calvin: I'm still learning it. Being an onion is a difficult role, you know. What are you? Susie: I'm "fat." Calvin: No. I mean in the play. Susie: Anyone else want to say it?!? Calvin: Aackk! Understudy! Understudy!