Demetrious Johnson and 4 other incredible walk-off KOs

#4. Lando Vannata vs. John Makdessi, UFC 206

At one point in time, Lando Vannata was an undefeated UFC fighter with 7 of his 8 victories all coming by way of either knockout or submission. An educated striker with a breadth of technique, much was expected of him.

Unfortunately, at UFC Fight Night 91, Vannata encountered an insurmountable challenge from a surging Tony Ferguson. The latter was amassing the most impressive win streak in UFC lightweight history.

Vannata fought admirably, but ultimately lost. His rebound bout came against John Makdessi at UFC 206, and 'Groovy' wasted no time in reminding fans of his highly touted skills.

Within one minute, he peppered Makdessi's midsection with front kicks, forcing his foe to straighten his posture, which exposed his chin. Vannata threw another front kick, yet as Makdessi straightened his posture, Vannata spun, smashing his heel into his foe's chin.

Makdessi immediately collapsed. Lackadaisical, 'Groovy' merely strode towards his opponent before turning away as the referee stepped in to assist an unconscious Makdessi.

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#3. Mark Hunt vs. Roy Nelson, UFC Fight Night 52

For the longest time, Roy Nelson's toughness enjoyed a level of reverence from UFC fans that only the Diaz brothers possess. Like both Diaz brothers, Nelson was erroneously described as a fighter who had never been knocked out.

All three men, however, suffered knockout losses. What they were was incredibly difficult to knock unconscious. So when Mark Hunt, one of the most powerful punchers in UFC history, faced 'Big Country' at UFC Fight Night 52, fans were excited.

Spectators wondered if Hunt could replicate a feat only accomplished by former UFC heavyweight champion Andrei Arlovski. By the 2nd round of the bout, fans got their answer. Hunt backed Nelson up to the fence, flicking out his jab.

As Nelson ducked, he unknowingly ducked into the path of a short uppercut from 'The Super Samoan'. Nelson immediately went limp, falling face first.

Mark Hunt raised his hands in celebration, intent on walking off before the referee sprinted over to shove the New Zealander away.