Calvin and Hobbes by Bill Watterson for March 01, 1988
Hobbes: Rosalyn sent us to bed and it's not even our bedtime yet! Calvin: We've got to escape. Here's the plan: You start moaning, and when Rosalyn comes in, I'll throw this blanket over her. We'll tie her up and make our getaway, got it? Hobbes: Got it. Mrowryowowwrrr Calvin: Rosalyn, come quick! There's something wrong with Hobbes! Rosalyn: Right, Calvin. What should I do, call a vet? Calvin: No, just come up here and close your eyes.