Here we have a nice little conversation between Loki and Fury. The best part about this clip is the small reaction on Mark Ruffalo's face when Loki calls the Hulk "a mindless beast". It's the look of someone who's had something deeply personal about them insulted and is trying to laugh it off. It's sort of an outward denial of the comment but recognizing its truth inside. Subtle but I imagine that's how Bruce Banner would feel about the Hulk.