This show is known for its surprising celebrity cameos. Not necessarily because it's surprising that the stars agreed to work with co-creator Nick Kroll (a no-brainer), but because you never know when Kristen Bell is going to show up as the jealous ex-sex pillow of Jason Mantzoukas' Jay. Or when The Office's Craig Robinson will voice a pubic hair and Kristen Wiig will stop by a few times to play teenage Jessi's vagina.