The original Hulk was created by Marvel comics. He was a huminoid monster, who's human name is Bruce Banner. Although Bruce was a normal human, he was exposed to a Gamma Bomb explosion, which was Bruce's own invention. Bruce was then exposed to extreme rage and temper problems. Seems how he is a genius, I guess that the bomb had an opposite effect on hime, or at least on his speach.
Guy Two: "Yeah, but what is it?"
*The Hulk comes charging down the street*
guy one and two: "OH SHI-"
Hulk: "SMASH!!! KILL!!! DESTROY!!!"