Doonesbury by Garry Trudeau for November 23, 1970
Mike: Well, here I am at my first college mixer and obviously doing very well indeed. College guy: Hey, Doonesbury! What do you say you go take a look at the new coke machine! Mike: Oh, yeah, sure! That's rich! The coke machine, right. The new coke machine, that's a laugh, ha, ha. Actually, it's quite tricky the way it works.