Calvin and Hobbes by Bill Watterson for November 19, 1986
Miss Wormwood: Susie, Where's Calvin? He goes onstage right after you! Susie: I don't know, Miss Wormwood. He was here a minute ago. Maybe he went to the boys' room. Miss Wormwood: He's on in two minutes! Fine time to go to the boys' room! Calvin: Fine time to get stuck in my costume. Stupid zipper!