Jeff is on the case during the episode "Cooperative Calligraphy." He's out to determine which member of the group swiped Annie's pen.
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Welcome to Halloween at Greendale. On the episode "Epidemiology 206," the group must deal with fellow students turning into zombies.
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Yes, there's a Greendale flight simulator. Jeff and company get launched in it on the episode "Basic Rocket Science."
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Poor Pierce. He believes his late mother has been vaporized and will one day return in full body form.
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Drew Carey guest stars on the Community episode "Accounting for Lawyers." He portrays an attorney.
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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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Jeff and Michelle have a discussion in the episode "Basic Genealogy." They are played by Joel McHale and Lauren Stamille.
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Pierce comforts Jeff in this scene from Community. It's courtesy of the episode "Basic Genealogy."
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Community Quotes

Abed: Sometimes I like to pour hot chocolate mix into cold milk and drink it with hot cocoa, I call it special drink
Jeff: And some day you will know it by its true name, diabetes

I'm sorry Annie. I'm not the worker-bee type. I'm more of a silver back gorilla with the claws of a lion, the teeth of a shark and the quiet dignity of a tortoise.

Jeff