Calvin and Hobbes by Bill Watterson for July 23, 1986
Rosalyn: OK... Everyone in the water! Calvin: I refuse! I'm freezing already! Rosalyn: Calvin, do you know what a "rat tail" is? Calvin: No. Rosalyn: It's when you soak a towel and twist it up into a whip. It stings like crazy and is much worse than being cold. Get my drift? Calvin: I always thought lifeguards were just taught how to resuscitate people and things like that.