The knockout -- the exclamation point of combat sports.
A lot of different styles and techniques are utilized in mixed martial arts, but there's still nothing more visceral than a good old-fashion KO.
Over the course of the UFC's fifteen-plus-year history there have been some stunningly violent finishes.
In one of the most brutal flurries in MMA history, Phil Baroni unloads with several unprotected shots to Dave Menne's face
While celebrating his win, Baroni began to yell, "I'm the greatest of all time!" He now holds a professional record of 13-10.
In his first middleweight title defense (the belt is now known as the light-heavyweight championship), Frank Shamrock ducked a jab, picked Igor Zinoviev up and slammed his head into the ground. The force of the drop knocked Zinoviev out and broke his collar bone, ending his MMA career.
After a quick scramble, Yves Edwards secured standing control of Josh Thompson's back. As Thompson began to spin out Edwards took to the air, delivering the type of kick you'd normally see in a Jean-Claude Van Damme movie.
In one of the most famous knockouts in UFC history, a young Pete Williams shocked the world by knocking out former heavyweight champion Mark Coleman.
The fight itself was a grueling back-and-forth battle. As they entered the overtime period, Williams connected with a huge head kick, dropping Coleman to the mat.
The UFC's sole trip to Brazil saw two MMA legends square off. At the time, Belfort was a hot commodity in the sport and Silva was seen as a very promising up-and-comer.
The fight didn't last long. Silva came forward, but was sent back with a stiff jab. As he stumbled, Belfort charged at him, unloading with an incredible flurry of punches.