Tyrone Spong scored one of the most devastating knockouts in kickboxing history and his final blow genuinely sounded like a gunshot - it was that loud.
Spong's bout against Michael Duut at Glory 9: New York back in June 2013 will go down as one of the most brutal finishes in kickboxing history.
And it came after he was floored by a stinging straight right-hand. Within seconds of the bout starting, he got tagged but bounced back to his feet.
Duut jumped on Spong, landing a few ferocious punches including a hard left-hook that appeared to rock his opponent.
But Spong remained composed as he avoided Duut's assault. He also kept his distance, setting himself up for a big shot.
Duut walked onto a monstrous overhand right that caught him flush on the chin, crumbling to the canvas.
The punch from Spong sounded like a gun shot, with @Grabaka_Hitman claiming it was the loudest punch he's ever heard in person.
Fans couldn't believe the sound Spong's KO produced.
One tweeted: "Literally pulled a 'Call an Ambulance! But not for me!'"
A second wrote: "Right hand from hell. This punch is so insane."
A third added: "This is one of the most vicious overhands ever. Listen to this sh*t."
Another commented: "What in the f**k is that right hand from Spong?! The sound of that!"
Spong would go onto beat Filip Verlinden then Danyo Ilunga in the final.
Meanwhile, he returns to action on the weekend when he takes on Sergei Kharitonov at Khabib Nurmagomedov's MMA event.