John Ratzenberger as Cliff Clavin on 'Cheers' in the 1980s Cheers wouldn’t have been the same without Cliff Clavin — and the beloved character wouldn't exist without John Ratzenberger's quick thinking ...

Believing that he bombed his audition, the actor secured his spot in the sitcom by creating his own character, Cliff Clavin NBCU Photo Bank/NBCUniversal via Getty Cheers wouldn’t have been the same ...

The character of Cheer’s customer, know-it-all mail carrier Cliff Clavin, was portrayed by actor John Ratzenberger. The trivia espousing postman was often shown interacting with friend and fellow bar ...