First of all, shame on you. But second of all, we have something that might help you catch up in time for Season 3: this hilarious mashup that essentially highlights everything you need to know about the Greendale Community College Human Beings from Season 2 of the NBC show.

Spoiler alert: They're all insane. Watch the video below.

'Community' returns to NBC Thu., Sept. 22 at 8PM. Stay tuned for more 'Community' goodies tomorrow!