Nice Steve Carell interview from a while back (when the US version of The Office wrapped), with commentary on Chicago vs everyone, careers, tv/film production, marriage, and facial comedy:

If I start deconstructing my face or what I’m doing, I think I’m in jeopardy of becoming way too self-aware. I never want to go to the mirror and start practicing expressions. You don’t practice them in real life—you just respond to things. To practice how you would look if someone ran over your foot is silly.