That was a great moment with Hulk... but I think the best dialogue is below. [Highlight it to see it so I don't spoil it for those who haven't yet...]
Bruce Banner: "I don't think we should be focusing on Loki. That guy's brain is a bag full of cats. You can smell crazy on him."
Thor: "I care how you speak. Loki is beyond reason, but he is of Asgard. And he is my brother."
Natasha Romanoff: "He killed eighty people in two days."
Thor: "He's adopted."
LOL
Yes, that was fantastic. Whedon can write ‘em!