I literally cheered when it happened. The fact that Sansa manipulated the whole thing just as he had manipulated so many things up to that point was awesome. He started the scene so sure of himself, with an incredible look of arrogance as Arya was brought before Sansa and Bran and the charges were being read. Then watching him become a whining, begging coward as he realized what was going to happen was very satisfying. I had to immediately go back and watch it again.