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20 Greatest Sitcom Characters of All Time

10 of 22

12. Cliff Clavin (John Ratzenberger), 'Cheers'

Cliff Clavin is a United States postal worker and a regular at the Boston watering hole called Cheers. An insufferable know-it-all, Clavin will say just about anything to get a rise out of his fellow bar patrons. Cliff is rarely successful with women, lives with his mother and once appeared on "Jeopardy!"

John Ratzenberger played Cliff from 1982-1993.—XFINITY Entertainment Staff (Photo: AP)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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