Back in 2014, welterweights Luis "Sapo" Santos and Alfredo "Tsunami" Morales entered the XFC octagon in Brazil.
The pair were evenly matched heading into the third round of the contest, but that all changed when Santos spotted a gap in Morales' guard and delivered a kick on Morales' chin.
Watch the lightning fast kick here...
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Credit: XFC
Pow. Right in the kisser.
The force of the blow earned Santos a straight knock out at the XFC International 3 event.
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Which reminds me of this contender for 'knock out of last year', courtesy of Lando Vannata...
Lando Vannata's Spinning Wheel Kick Knock-Out Of John Makdessi
Lando fought John Makdessi in a prelim battle at UFC 206 in Toronto yesterday, winning by - you guessed it - knocking him the fuck out.
Take a look at the spinning wheel kick that earned him his first UFC victory here...
Vannata was competing in just his second UFC bout after his loss to top lightweight contender Tony Ferguson in July, and last night he showed us why he's being tipped for big things in the future.
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Makdessi looked to be alright by the time he left the Octagon, but this is now his third loss in four fights.
Meanwhile, Vannata is now 1-1 in the Octagon, with his overall fight record at 9-1.
And this, which has to rate as one of MMA's sickest moments.
The Most Badass Moment In UFC History?
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There have been some sick moments in UFC History - that Forrest Griffin and Stephan Bonnar fight, when Matt Serra shocked the World, Jon Jones becoming the youngest champ in history.
But is there anything greater than this...
Video credit: UFC
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Joe Lauzon vs Jim Miller, both of them covered in blood.
"Hell of a fight, bro." "You too. I'm having fun."
Featured Image Credit: XFC