Last July, Ewan McGregor sat down for a chat on the The Graham Norton Show. Seated alongside Chris O'Dowd, McGregor spent most of the segment discussing his role as Obi-Wan Kenobi in the Star Wars prequels, but the conversation took a distinct turn for the absurd when Norton asked the actor about his sex scene with Christian Bale in Velvet Goldmine. The scene itself unfolded atop a rooftop in London, though director Todd Haynes and his camera crew were positioned on an opposite rooftop, capturing the action from a wide angle. Once the cameras started rolling, McGregor and Bale dutifully went at it, as the Trainspotting star so brilliantly re-enacts in the above clip. The only problem, though, is that they didn't know when to stop.