"Extra's" Terri Seymour got a nice surprise when she sat down to interview "Trainwreck" stars Amy Schumer and Bill Hader about their film.

Turns out, a special guest was sitting in for Bill Hader… none other than "Mad Men" star Jon Hamm! Jon, pretending to be Bill, shared some of his best "SNL" character impressions and chatted about the palpable, on-set sexual tension with Amy.

Watch the interview!

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