Doonesbury by Garry Trudeau for September 14, 1973
Man: Okay, my man, I'll tell you why we keep to ourselves! It's 'cause we don't want to be no part of someone else's liberal "education"! Sure, man, you make an effort, but it's stone self-servin'! We don't want to be an experience for nobody! Mike: "Anybody." Man: What? Mike: Double negative. Man: Take a walk, man!