Calvin and Hobbes by Bill Watterson for September 09, 1995
Calvin: I finished all my homework, just like you said to Rosalyn. Rosalyn (babysitter): Great. Are you ready to play you game then? Calvin: First we need to make you a mask. Rosalyn: A mask? What for? Calvin: When you play Calvinball, you wear a mask. Rosalyn (babysitter): Why? Calvin: Sorry, no one's allowed to question the masks. Rosalyn (babysitter): This sounds like a great game.