I think we all remember the "Bye Bye Birdie" fiasco that took place on the last season of Mad Men, and the cast and crew had some fun with the song behind the scenes. Watch as they sing and dance over Ann-Margaret's high-pitched voice — it's worth it to see John Slattery in a wig and Jon Hamm showing off his famous moves with a ridiculous grin on his face. To see it, just
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