Grey Maynard once managed to knock himself out with a slam meant to KO his opponent.
Maynard was taking on Rob Emerson in 'The Ultimate Fighter' 5 finale back in 2007 and seemed in control.
Maynard got hold of Emerson in the second round and slammed him down to the mat with brute force.
But 'The Bully' managed to smash his head on the canvas and knock himself out.
He rose to his feet in a daze and Emerson was clutching his ribs and both men were in clear agony.
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The referee ruled the result to be a double TKO and the bout was a draw.
It came as a bitter blow to Maynard in the reality show's finale as he weathered an early storm to assert control on the fight.
Joe Rogan was analysing the fight and noticed the state Maynard was in.
"He was so badly hurt going into the round that this was just the icing on the cake, but it's so crazy that Gray knocked himself out, look, he's gone."
Maynard was in disbelief at the result and was inconsolable.
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He spoke to Rogan immediately following the fight and it was clear he was not in the best of states.
Rogan tried his hardest to explain to Maynard, who was clearly still concussed.
"I remember sitting in the corner. He tapped; I thought it was over.
"I rolled over. Of course I'm a little tired....My arm was under his back.
"I was waiting for my arm to get out. He was waving Emerson off. I don't understand this, man. I'm dead serious."
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The 40-year-old also frequently told Rogan that he was never unconscious and he only rolled over due to tiredness.
Rogan then spoke to Emerson after the fight as boos still echoed around the Palms Casino Resort.
Footage of the incident was replayed as Rogan explained where the head injury occurred.
Emerson explained his disappointment at the fight ending in a double TKO and that he wanted a better conclusion for the fans.
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"I know (he's out) but I don't blame him, I don't blame me, it's just one of those things that happens."
Despite the boos in the arena, the fight has managed to live on in infamy due to it's dubious finale.
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