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.

Check out the video for McGregor's hilarious narrative, and for more Christian Bale, be sure to check out our 3 Film DVD Collection, now available on Amazon.