Working across from Michael Fassbender as her brother was "a complete dream"; Mulligan recalls McQueen coming in after a take and saying, "'Fuck! It's like fucking Ginger Rogers and Fred Astaire in here! Awesome!'" As for the backstory that Sissy and her brother share--an issue of debate--Mulligan says they "definitely had conversations about where these characters came from," but adds, "that's the cool thing: I don't want to know that stuff, and it's not interesting to talk about that in a film, because it victimizes them in a way that it shouldn't. It's about the business of how they're handling where they are right now." The "Shame" trailer is below, with Mulligan's heartbreaking rendition of "New York, New York" (a new Red Band trailer will be appearing later today). "Shame" hits theaters December 2. You can also explore the film's New York City locations with McQueen and this interactive map (spoilers).