At some point, you have to disconnect, if the obsession with playing a real person gets in the way of the movie at large. At the same time, we're all interested, as actors in trying to get as close to the real thing as we can, and whatever you can do in order to create that transformation feels fun and, for me, the furthest I can get away from myself is fun. It's all part of the costume, the accent, and all that stuff. It's about trying to get close without it being a detriment to the point of view of the story that you're trying to tell.