"This I liked, too. Tom really sells the idea at first that, "Oh, maybe it’s going to be Iron man versus The Avengers." And then, oh, the logic of the thing is, "Oh, he can’t get at his heart." And Tom is very good, and this is something that anybody who knows any of my work will know, I always require going from, you know, scenery-crunching villain to Noel Coward play. And his little, "Oh, this usually works," is such a delight."
Joss Whedon during The Avengers commentary.