Community Halloween Special

I watched this a couple nights ago and I really enjoyed it.  Community is becoming one of my favorite shows on television.  It follows a diverse group of friends that met through a book club that Jeff Winger started to get Brinda's phone number.  The Halloween special takes place at a party in the community college library.  The Dean, dressed as Lady Gaga, is serving a food that he got from the Salvation Army.  Apparently that food is very powerful and people start turning into zombies.  Most of the episode is the group of friends avoid getting bitten.  Eventually everyone except Troy gets bitten but he goes back inside after the dean is told to quarantine the Library and keep the zombies inside. When Troy goes inside his plan doesn't work as he thought it should, but he does get to hit the thermostat to make it cold so that people wouldn't die from brain hemorrhaging.  At the end the army comes and drugs everyone and when they wake up they don't remember what happened.  They just think that someone drugged everyone.