'Mad Men' Cast and Crew Sing "Bye Bye Birdie"

Watch this fun video of the cast and crew of Mad Men singing "Bye Bye Birdie" -- which was apparently recorded as a joke at the AMC drama series' wrap party, to thank creator and executive producer Matthew Weiner.

It's a shame Bryan Batt (who played Sal Romano) wasn't a part of this, as his rendition of the song was a key scene in Mad Men's third season. But a drunk John Slattery dancing and singing in a wig more than makes up for it...

And just for fun, why not compare their performances with Anne Margaret's:

-- Daniel Lehman