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'Cheers' Cast Then & Now

THEN: John Ratzenberger as 'Cliff Clavin'

U.S. Postal worker Cliff Clavin is the bar know-it-all. He is often found sitting next to his best friend, Norm Peterson. Clavin used his vast knowledge of useless facts to compete on “Jeopardy!,” but lost on the final question. —XFINITY Entertainment Staff (Photo: NBC)

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