As the Hulk, Banner is capable of significant feats of strength, the magnitude of which increase in direct proportion to the anger felt by Banner.
As the character himself puts it, “The madder Hulk gets, the stronger Hulk gets!” Strong emotions such as anger, terror and grief are also triggers for forcing Banner's transformation into the Hulk.
He then proceeds to destroy everything with his awesome hulk fists.
And now those fists are an awesome 8GB USB Flashdrive!