Calvin and Hobbes by Bill Watterson for September 22, 1990
Calvin: Man, this is going to be great! Not only am I going to ace this quiz, but I'm going to win a quarter from Susie when I get a better score than she does! Ok! The first problem is 6 + 5. Oh, easy! The answer is...um.....ummmmmmmm... Calvin/Spaceman Spiff: His spacecraft quietly humming, the incredible Spaceman Spiff approaches the sixth planet of the mysterio system!