Sometimes, fighting causes brain damage.
Other times, brain damage causes fighting.
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UFC president Dana White, when asked by reporters what he thought of Bryce Mitchell's pro-Hitler comments, replied:
“We’re disgusted by it. I think he’s literally one of the dumbest human beings. Let’s not forget this is a guy who took a drill through his nut sack then had to reverse it. That’s the level of stupid that we’re talking about here."