From Dobie Gillis, but not Dobie—Maynard G. Krebs character. Played by the late Bob Denver who would later play the title character on Gilligan’s Island, of course.
Clip from the show—and is that Mike Huckabee as Dobie’s dad?
http://www.youtube.com/watch?v=pqzpQPDSr2s
Ah, right. Dobie was the clean-cut square. I only remember the show from the reruns my uncle introduced us to in the early 80s.
More trivia: the girl who played Dobie’s girlfriend (Gilda?)in her real world life went on to become a high-powered patent attorney.