DUDE, NOW SHE'S CALLIE O'MALLEY: This was a rather extraordinarily acted Grey's we saw tonight. I have to hand it to Ellen Pompeo: tonight's episode included the most impressive acting performance we've ever seen from our lovably (and now explicably!) flawed title character. Kate Burton brought out the best in her, not to mention the best (or was it the worst?) in Ellis herself. Nicely done.