They were in prison together at some point in the novels.
LaddxFiro
Also, we're being made to suffer through another gut-wrenching movie about Bruce Banner and his anger management problem. True, Ang Lee is a horrible director in the first place (remember Brokeback Mountain?) and horribly screwed up the first version a few years ago, but this green guy just annoys me. I'm like, keep it in control, you Jekyll and Hyde ripoff. Boo to Hulk. Boo and poop on you.
This is why we can't have nice things!