The further you get away from yourself, the more challenging it is. Not to be in your comfort zone is great fun.

I want to be able to play trailer-bound fatties in a Judd Apatow comedy.

The first time we did cavalry charge I was so breathless with excitement I nearly fell off the horse. I actually saw stars in front of my eyes and thought I was going to faint. The second time I had a bit more control but was still giddy with excitement. And the third time I was an emotional wreck. I had to really try hard not to cry.

I love the idea of playing something stupid or romantic. I'm not the smartest man in the room. I listen, and I learn, and I observe, but I'm always playing characters with intellects profoundly superior to mine. That's great fun, even though it's as much a fantasy for me as for the people watching me.

I'd love to do a noir. I think Steve McQueen is so cool. But a classic film is a classic film, and perhaps the fantasy of being those characters should be left alone. You're treading on very thin ice.

[Doctor Strange ] is slightly more specialised than Spider-Man or Superman or Batman, but he's very loved by people who know him.

I had to imagine myself into certain aspects of [Julian Assange] character for our version of events. That involved extrapolating based on clues in his biography, his public persona, photographs, and other accounts of him by people who encountered him during that extraordinary period from 2007 to 2010 that we charted in the film [The Fifth Estate]. So, it involved a lot of research but, sadly, no contact with the man himself.