UFC 281, Madison Square Garden, 2022. Alex Pereira was losing to middleweight champion Israel Adesanya going into the last round.

He trapped Adesanya on the fence and unloaded until the referee jumped in. New middleweight champion.

UFC 278, 2022. Kamaru Usman was cruising to another title defense. Less than a minute to go.

Leon Edwards faked low and threw a left head kick. Usman was out before he hit the floor. The commentator's call — "Leon Edwards, headshot, dead!" — went viral within minutes.

UFC 239, 2019. Ben Askren had mocked Jorge Masvidal for months.

At the bell, Masvidal sprinted across the cage and threw a flying knee. Askren was unconscious before he hit the mat. Five seconds — still the fastest KO in UFC history.

UFC Fight Island, 2020. Impa Kasanganay caught Joaquin Buckley's kick and held on to it.

Buckley spun on his trapped leg and landed a spinning back kick to the head with the other one. Kasanganay was out before he fell. The clip has been watched tens of millions of times.

UFC 300, 2024. Max Holloway was winning comfortably against Justin Gaethje. With ten seconds left, he pointed at the centre of the Octagon: stand here and fight me.

Gaethje accepted. They swung. With one second on the clock, Holloway landed a right hand that put Gaethje face first on the canvas.

Few knockouts have been replayed more.