Doonesbury by Garry Trudeau for March 18, 1998
Sam: Yikes! Isn't that cold, Zonker? Zonker: I'm used to it, Squirt...during my commune days, this was one of my favorite spots! Sam: How come? Zonker: Well, there was an energy crisis on. To conserve heating oil, I'd come down here to bathe! Sam: You bathed in pond scum? Zonker: Um...it wipes off.