NPR's guide to the running gags from the show.
Characters attempt to express strong emotion, with little success.
4 episodes feature this joke:
Lucille: "I'll be out of jail before you work up your first tear."
Lucille almost cried for the first time in 60 years until Tobias cut her off.
Sources: Joke data compiled by Adam Cole / NPR. Episode metadata from The TVDB via a Creative Commons Attribution 3.0 United States (CC BY 3.0 US) license.