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Of all the submissions, all the chokes, all the wrestling that UFC fighters use to quench their bloodthirsty fans, there is simply nothing sexier than a knockout. Brutality personified, knockouts give MMA the gladiatorial, two-men-enter-one-man-leaves kind of feel to which cage fighting should always aspire. The UFC boasts an illustrious legacy of men being hit so hard that their brains momentarily shut off, leaving their unconscious bodies at the mercy of an intervening referee. Even after two decades of knockouts, some stand out as historic.