Last Saturday, Cain Velasquez and Junior Dos Santos took part in a great MMA battle that ended with Dos Santos recording a knockout. The only problem? That knockout was actually recorded against himself. He knocked himself out when he faceplanted into the mat in the fifth round of the match. It was pretty embarrassing, but it was not the first time that an MMA fighter has knocked himself out. Just check out Cage Potato's list of the most brutal self-inflicted knockouts in MMA history over here. Pretty crazy.

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[via Cage Potato]