Cliff Clavin
Clifford C. Clavin, Jr. (born 1947 or 1949) is a fictional character on the American television show Cheers played by John Ratzenberger. A postal worker, he is the bar's resident know-it-all and was a contestant on the game show Jeopardy! Cliff was not originally scripted in the series' pilot episode, "Give Me a Ring Sometime", but the producers decided to add a know-it-all character and Ratzenberger helped flesh it out. The actor made guest appearances as Cliff on The Tortellis, St. Elsewhere, Wings, and Frasier.
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