You know how when actors get famous—but not too famous—and they do a commercial for something, it's hard to tell if they're a spokesperson for the product, or just an actor in a commercial?

That's what it was like when I saw this Excedrin ad with Mad Men's Elizabeth Moss (aka Peggy Olson). S. Epatha Merkerson's ad for blood pressure medication is definitely a spokesperson kind of thing, but it's hard to tell with this Moss spot. I'm thinking it was probably just an acting gig, because it would be weird to be known for her migraines, but you never know.