Calvin and Hobbes by Bill Watterson for October 23, 1990
Transcript:
Calvin: Look Mom, I made a mask. Mom: Are you getting ready for Halloween? Calvin: Huh? No, this is for every day. You know how Hobbes always sneaks up from behind and pounces on me? Mom: No... Calvin: Well, he does. But if you wear a mask like this on the back of your head, tigers can't tell which way you're facing, and they can't sneak up. Mom: I think you train of thought is a runaway. Calvin: I read they wear these in India. Here, I made a mask for you too.
Mom is confused by the whole premise. Apparently, she has never observed Calvin being attacked by Hobbes.