There was a scene in a recent episode where Jack was grilling Hannibal (heh- not literally) about how he thought Hannibal was "protecting" Will and the daughter of that first serial killer. Hannibal effectively pantomimes the normal human reaction to finding out what he had unwittingly done (which, as the audience knows, he did totally wittingly and not for the reasons Jack thinks). Then as soon as Jack is out of frame, the normal human disappears and he gets this absolutely reptilian expression of being pleased with himself. It's a brilliant piece of facial acting that really kind of encapsulates everything I love about this show. I wasn't sure at first about Mads Mikkelson as Hannibal (I hadn't seen him in anything else and found him a bit robotic at first) but he has really won me over.