As a bonus, this is the full sequence from which you see the snippet above of Marion Cotillard recreating a moment of her Oscar-winning role, lip-syncing as Edith Piaf in La Vie en Rose. The snippet above doesn't do the sequence justice, which I saw live. On the show, the segment began naturally enough, as host Norton asked her about the training to prepare for the role and particularly for the lip-syncing, which was particularly remarkable. (One of the guests, Frank Skinner, even interrupts her to say that until that moment when they were discussing it, he had no idea she had been lip-syncing and thought it had really been her.) And then the conversation slid into Norton asking a favor. Now, it's possible that it was set-up beforehand, but it seems not. I was going to say that if she's faking her angst then she's a really good actress -- but then, she did win an Oscar for the role, so, yes, she's a really good actress. But I'm going to throw my coinage down on betting that she's thrown for a loop by the request. In any event, she does an absolutely wonderful job, again, at a moment's notice.
(And fun too are watching the other actors watching her in admiration -- because, as she notes, there's a physicality to it, and she really throws her whole self into it -- that's James McAvoy to her left, but most especially Michael Fassbender to her right.)