John Fury was caught making an obscene gesture during his destruction of the stage in the pre-fight press conference for KSI vs. Tommy Fury and Logan Paul vs. Dillon Danis.
KSI, Tommy, Paul and Danis took part in a launch presser for their blockbuster Misfits Boxing card in Manchester on October 14.
But the press conference came to an abrupt end when 'Big' John absolutely lost his head and flipped the tables before causing a brawl.
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He appeared to rage over KSI's claim of Tyson Fury ducking WBA, WBO and IBF world heavyweight champion Oleksandr Usyk.
Amid the chaos on the stage, John furiously shouted "f**k KSI" while thrusting his hips and grabbed his groin in an obscene gesture.
After the commotion, KSI and Tommy returned to the stage and faced-off, with John losing his head for a second time as he had to be restrained by security.
Speaking after the press conference, the 59-year-old said: "The only trouble is I’m not trying to entertain, I f**king mean it. I’ll take somebody’s life, me, in these places.
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"I wanna see some action. People are paying good money to see it, let’s see it.
"We can talk words but talk does nothing. Actions speak louder than words. I’m prepared to go, I’ll rock and roll anywhere, anytime, anyplace."
He added: "I’ve never been beaten in my life out in that ring ever! And those schoolboys couldn’t even come close.
"Honestly, I’ve wiped my a**e on better men than any of them. Any one of them. And they’re sat there talking about this, that and the other - about what people do in bedrooms and all that sh*t.
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"I'm a real man. I’m the only man on the island. I’ve said it before. John Fury! That’s me! End of."
On the incident with John, KSI said: "It was chaos, absolute chaos. John Fury, what a mad man."
Nasir Jabbar