NPR's guide to the running gags from the show.
An expression of displeasure with current circumstances.
16 episodes feature this joke:
G.O.B. manages to coax out a "come on" at the end of his stuttering monologue with Ann.
Related Joke: Stress stuttering
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.