Mixed Martial Arts
MMA doesn't just look brutal, it IS brutal. People get knocked out, broken bones, and punches straight to the face. Not having helmets on is part of the game, so that's how you know it can get ugly.
Punching and Kicking
The most common injuries in MMA are facial lacerations (from toenails and blunt force) and concussions. Concussions are the largest cause for concern; they're the silent killer. Only three people have died due to MMA in the past 20 years, but that's only because they have trained medical staff ready to jump in at a moment's notice.