Stacy's Blog Has Got It Going On

 "I broke my legs, not my gender." -Pierce Hawthorne "Mixology Certification" picks up with the group celebrating Troy's (Donald Glover) 20th birthday in the study room.  During some birthday trivia from Annie (Alison Brie), Troy reveals that he was born in 1989, not 1990.  He had to repeat 5th grade and his mom tried to make him feel better about it by telling him everyone is 10 for two years.  The group realizes he is actually turning 21, so Jeff (Joel McHale) insists they go out to a bar so Troy can have his first legal drink.  Jeff wants to go to L Street, which Britta (Gillian Jacobs) hates, so she suggests The Red Door.  Jeff hates that bar, so they settle on one that appeals to everyone, Flanahan's Hole.  Annie, who is underage, is sad about not being able to go, but Britta gets her an ID that belonged to a woman named Caroline Decker from Corpus Cristi, Texas. Jeff drives Troy and Abed (Danny Pudi), but they discover Flanahan's Hole has closed,...