Doonesbury by Garry Trudeau for April 24, 1972
Zonker: Well, Bernard, will you look at that? Bernie: A puddle!....What's a puddle doing out on a sunny day like this? Zonker: It must be a spring-fed puddle! Bernie: Imagine! A small body of water right on our own property! Zonker: Well, of course! All the great communes have overlooked small bodies of water! Bernie: What'll we call it? Zonker: Walden puddle.