As one of the most dangerous sports, it shouldn't come as a shock to many that MMA fighters are crazy.
Just getting into the ring is reason alone to question one's sanity.
Taking blows to the head and pounding an opponent into unconsciousness.
From fighting techniques to legal troubles, some of the world's best fighters fuel their aggression to higher levels.
As leagues such as the UFC increase in popularity and Pay Per View continues to dish out events, mixed-martial arts becomes more relevant to pop culture.
Here are the 10-most "bat-crazy" MMA fighters around.