Jeff takes on some bullies on the episode "The Art of Discourse." This character is played by Joel McHale, of course.
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Community Season 1 Episode 21 Quotes

Annie: When you found out I was Jewish, you invited me to a 'pool party' that turned out to be a Baptism.
Shirley: Well excuse me for trying to sneak you into Heaven.

Britta: So what's the context for constantly calling me as a lesbian?
Pierce: If the wallet chain fits... I'm just trying to help you find yourself.