Cheers (1982)

S8E14 What is... Cliff Clavin?

In Boston, Cliff finds himself on Jeopardy! and is thrilled to see that all six categories align with his expertise, covering topics like celebrities and the US Postal Service. However, when it comes time for Final Jeopardy, he makes a regrettable mistake, answering with "Who are three people that have never visited my kitchen?" and loses all his winnings, leaving him feeling disheartened. Meanwhile, Sam discovers that his little black book has been swiped, and someone has begun calling all the women listed in it.