The fight between the Hulk and the three Hulk-dogs is the first time the movie portrays Hulk as a hero as he protects Betty. It's also a brutal mix of brawling and strategy:
The way he injures Sammy is priceless. Hulk grabs him by the back leg, holds him upside-down, and punches him right in the gamma-nads. It could be Hulk's way of getting indirect payback for Lily's cheap-shot groin attack on him beforehand.
Later, Sammy bites and latches on to Hulk's left trapezius. When Hulk can't pry him off with his hands, Hulk flexes his muscle—still in Sammy's mouth—until it grows large enough to break his jaw.
Bruce refuses to transform and stifles his anger while Talbot attacks him with a cattle prod, knowing what Talbot plans to do. Bruce tells Talbot that he will never allow him and his Mad Scientist group to get what they want.
The Epic Fail of the syringes failing to penetrate Hulk's skin:
After realizing that Bruce won't transform consciously—despite how much he gets beat up—Talbot decides to stick Bruce in a machine that will pull the most painful things from his subconscious to make him turn to Hulk, with drill-tipped syringes to get samples when he does transform. But when Talbot finally does induce a transformation, the change has begun even in the very next second. Hulk's skin is tough enough to resist the drills, and Talbot has a brief but epic Villainous Breakdown.
The Hulk's escape from containment. Adaptive genetics make him immune to Knockout Gas, bullets bounce off his skin—which is tougher than Kevlar—and he has a healing factor that would make Wolverine proud.
The Hulk battling the tanks: he flips one tank over, grabs it by the cannon, and hammer throws it into the distance. Then Hulk rips the top off of another and uses it as a club before advancing on the last tank with an expression that screams "beatdown time." Instead of tearing them apart, he walks right up to them and then slams the cannon to the ground, at which point the soldiers duck into the tank in fear. Then Hulk bends the cannon back until the end of it is inches from a soldier's face, which has an Oh, Crap! expression.
The Hulk's ability to leap miles at a time and run over one hundred miles an hour is handy when outrunning hunter helicopters and slapping aside missiles.
The Hulk catches a missile effortlessly while running, holds it while the rocket is still firing, rips the warhead off with his teeth, and then spits it at a helicopter's tail.
Hulk saves a soldier's jet from crashing into the Golden Gate Bridge, proving that Hulk is still a hero despite his destructive tendencies.
Although implied, Bruce briefly regained control to save the jet and the drivers on the bridge.
