Nolan analiza su escena favorita de "El caballero oscuro"

For me creatively, that had been about inverting the expectation. We’ve all seen so many of these dark movie interrogation scenes where somebody is being given the third degree. We just wanted to completely flip that on its head.
[...]
Christian and I had talked a lot on "Batman Begins" about finding a moment in that film where you actually worry that Batman will go too far. A moment where his rage might spill over and he would break his rules. We never found that moment. It just wasn’t there in that story. There was a lot of strength and aggression in the way he played the part, but I don’t think the story provided that element of losing control. What the Joker provides in the second film is the fact that his entire motivation is to push people’s buttons and find their rules set and it turn it on itself. And Batman of course places such importance on his rules, his morals. It’s what distinguishes him, in his mind, from a common vigilante. The Joker is able to twist him around and make him question his own approach and his own actions.

Los Angeles Times