Calvin and Hobbes by Bill Watterson for September 01, 1995
Mom (Calvin's mother): Hello? Mm-hmm...No thank you, I'm not interested. Hmm?...No, I don't want...mm...as I said, I don't...mm-hmm..no, I...mm...look, I'm not...hmm?... Did it ever occur to you that I have a life beyond this sales pitch and you're intruding on it?! There would be more civility in this world if people didn't take it as an invitation to walk on you. Calvin: I'm only civil because I don't know any swear words.