The top 5 KOs

, Last Updated: 1:47 PM ET

5. Tank Abbott sends John Matua into convulsions [UFC 6: Clash of the Titans]

Tank Abbott truly epitomized the nasty early days of the UFC. Every time he stepped foot in the octagon, you knew you were going to get raw brutality. He's certainly far removed from the type of athletes that occupy the organization these days.

Perhaps no knockout sums this up better than when he sent John Matua into convulsions. To top it all off, Abbott began mocking Matua's twitching. What a classy guy.

4. Keith Hackney ensures there will be no Joe Son Jr. [UFC 4: Revenge of the Warriors]

Back when almost all forms of attack were legal and everything else was simply frowned upon, Joe Son received one of the most uniquely devastating blows seen in the sport.

Son, who would later go on to play Random Task in "Austin Powers: International Man of Mystery," fought Keith Hackney at UFC 4.

Things were going well enough as Son attempted a guillotine choke. However, Hackney managed pass into side-control and began unloading with punches to his opponent's groin area. Eventually Son gave up and the finish was ruled a submission due to a choke.

'Choke' must be Latin for "repeated punches to the testicles."

Last October, Son was arrested and charged for his alleged participation in a gang rape in 1990.

What did John Lennon say about instant karma again?

3. Gabriel Gonzaga gives Mirko ‘Cro Cop’ a taste of his own medicine [UFC 70: Nations Collide]

After winning the PRIDE FC 2006 open-weight grand prix tournament and subsequently leaving the organization, Mirko (Cro Cop) Filipovic was the hottest free agent in MMA.

The UFC quickly scooped up the man who stopped both Wanderlei Silva and Josh Barnett in the same night and who was known for having the most devastating left leg in the sport.

'Cro Cop' seemed destined for great things and a showdown with then UFC heavyweight champion Randy Couture was practically a given.

That is until, he found himself on the receiving end of a Gabriel Gonzaga head kick.

2. Gary Goodridge throws elbows like they were going out of style [UFC 8: David vs. Goliath]

In the first round of the David vs. Goliath tournament, Paul Herrera was handed the unfortunate task of chopping down Gary Goodridge.

As the fight began, he attempted an ill-fated takedown. Goodridge stuffed it and secured a crucifix position on the mat. From here, he unloaded with the nastiest elbows ever seen in MMA.

1. Tank Abbott liquefies Steve Nelmark [UFC: Ultimate Ultimate 1996]

Have you ever seen that episode of "Family Guy" where Peter inadvertently wishes he had no bones in his body, transforming himself into a puddle of human flesh?

A similar situation occurred years earlier at UFC: Ultimate Ultimate 1996. Only instead of a genie making Peter's wish come true, Tank Abbott's fist made Steve Nelmark's worst nightmare a reality.

Early in the bout the two clinched against the fence. After a bit of dirty boxing, Abbott delivered hard right directly to Nelmark's temple. The punch caused him to drop into a contorted position against the cage.

Click here for photos of more great knockouts

What's your favourite UFC knockout?

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