Yes, you do use one part of your brain at a time, but of course you use your whole brain.......why don't they do a movie about a guy who lives in 1 room bathroom/kitchen apartment, and ALL THE TIME HE SAVES BECAUSE THEY'RE ALL THE SAME ROOM...........De Niro shouldn't beat himself up, just because of 1 bad performance on SNL......he might want to do so because he didn't hold out till SNL had decent writers, but he's a good actor who's done good movies......all I've seen is the trailer & can tell this'll be a crap fest....Billy Bob De Niro should not be doing movies like this