Jon Hamm, Sam Page Jon Hamm, Sam Page

When did Mad Men become a horror movie?

Set against the backdrop of panic caused by Richard Speck's 1966 massacre of eight nursing students in Chicago, Sunday's episode, "Mystery Date," was filled with chills (a strangulation, things that go bump in the night at the Sterling Cooper Draper Pryce offices, grandma Pauline's butcher knife) and at least one thrill (Joan finally shipping her husband off to Vietnam for good).

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Drunk Peggy (our favorite kind of Peggy) tries to inspire Dawn with her own rise from secretary to copywriter. ("I know we're not really in the same situation, but I was the only one like me there for a long time," Peggy says.) But as Peggy realizes how different Dawn's plight is, she begins to question if she acts a bit too much like the men around her. "I try, but I don't know if I have it in me. I don't know if I want to."

Sadly, Peggy soon realizes that she has enough of "it" in her to be fearful of leaving her purse full of Roger's money lying on the coffee table while Dawn sleeps. Peggy tries to play off her pregnant pause, but it's too late. Dawn slips out the next morning, leaving a note thanking Peggy for her hospitality.

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