I never particularly liked the TV show, THE JEFFERSONS. It was strange, because they had an excellent cast, and the situations lent themselves to humor. But there was something annoying about it. I finally realized what it was when some station had a marathon of repeats: They never let the audience get a joke. Whenever they told a joke, they then proceeded to explain to the audience why it was supposed to be funny.
On the other hand, one punch line that was COMPLETELY unexpected, but made so much sense in retrospect that it is generally considered to be one of the funniest moments in TV comedy (and recently mentioned as such by Mark Evanier) was the conclusion to the series, NEWHART.