He was also good early in the run as a panelist on Match Game. He's the one who said his wife (Brett Somers) should join the show, and she did so well she stayed the entire run of the show.
This clip is fun:
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We may curse our bad luck that it's sounds like its; who's sounds like whose; they're sounds like their (and there); and you're sounds like your. But if we are grown-ups who have been through full-time education, we have no excuse for muddling them up.