Cheers - Season 8 - Eps 14: What is... Cliff Clavin?
Jeopardy makes an appearance in Boston, and Cliff gets on the show. The Jeopardy! round had all 6 categories Cliff specializes in, such as celebrities or the US Postal Service. But when Final Jeopardy approaches, he loses all his money putting a stupid response ""Who are three people that have never visited my kitchen?"" and becomes depressed afterwards. Meanwhile someone has stolen Sam's little black book and started ringing all the girls in it.
About Cheers

Title: Cheers
First Air Date: 1982-09-30
Last Air Date: 1993-05-20
Status: Ended
Rating: 7.565/10 (from 612 votes)
Language: EN
Seasons: 12
Total Episodes: 269
Network: NBC
Genres: Comedy
Production Companies: Paramount Television, Charles/Burrows/Charles Productions
Synopsis
The story about a blue-collar Boston bar run by former sports star Sam Malone and the quirky and wonderful people who worked and drank there.
Cast

Ted Danson
Sam Malone

Kirstie Alley
Rebecca Howe

Rhea Perlman
Carla Tortelli

George Wendt
Norm Peterson

John Ratzenberger
Cliff Clavin

Woody Harrelson
Woody Boyd

Kelsey Grammer
Frasier Crane