Looks like some inspired extracurricular activity at a Mad Men cast-and-crew party after cast and crew have had a few brewskis, judging from the number of brewskis being held by cast-and-crew members in this clip. Anyway, it's Jon, January, and the sprawling gang singing "Bye Bye Birdie" without even one of them being able to carry a tune. Not one. Yet it's the cutest thing. And stay tuned for the outtakes.