NPR's guide to the running gags from the show.
Lucille Austero suffers from extreme vertigo.
9 episodes feature this joke:
Despite suffering from a condition that is similar to sea sickness, Lucille 2 has decorated her apartment with a maritime theme.
Michael triggers Lucille 2's vertigo several times.
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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.