This is the moment when a fighter knocked out his opponent with a vicious flying knee to the face... at the WEIGHIN.
Unidentified fighters were just starting to fight at the Zames Fight Club in Belarus when one of them decided that he could not wait to see the octagon get started.
In all-white, the aggressor attacked his opponent with a vicious flying knee attack
RT Sports shared a video clip in which the aggressor can be seen wearing an all-white suit and looking at his victim, as he prepares to stand toe to toe with him.
Before the victim could fix his hat correctly, he was lying on the ground under the assailant.
The perpetrator appeared ready to attack again before security intervened and stopped him.
Some viewers were horrified by the brutal attack and demanded that the fighter be expelled for life.
This isn't the first time that we've witnessed stare-downs between fighters go wrong.
Paige Vanzant, an ex-MMA star, was involved in a furious brawl with Britain Hart just before she made her Bare Knuckle Boxing debut at Knucklemania.
After Hart pushed Vanzant too close to Hart's face at the weigh-in, Vanzant tried to grab Hart's throat. Security had to intervene to stop Hart from getting in between them.
Boxing also heated up when Alen Babic fought Mark Bennett at the weigh-in.
The slaps of the pair could have led to an all out brawl if not for security.
Even Anthony Joshua, who is usually calm and composed, lost his cool when he weighed in with Kubrat Pulev prior to their December bout at heavyweight.
After a heated exchange with the Bulgarian, AJ put his hand on the shoulder of his opponent and it looked like all hell was about break out.
They ended up trading barbs, and AJ called Pulev a p***y.
