John Fury has revealed his biggest regret in life was going to prison in 2011, with the 59-year-old opening up after headbutting a member of Oleksandr Usyk's team on Monday.
The father of heavyweight world champion Tyson Fury caused outrage by headbutting Stanislav Stepchuk, though he has since apologised for his actions.
John has always been a colourful character, somebody who provides fireworks wherever he goes.
However, life for the 59-year-old hasn't always been so good.
John Fury has said his biggest regret in life is going to prison for gouging a man's eye out ahead of his son's fight with Oleksandr Usyk on Saturday night
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Back in 2011, John was found guilty of wounding with intent to cause grievous bodily harm for gouging a man's eye out in a brawl.
He was handed an 11-year sentence before being released in February 2015.
And John, when asked by The Telegraph about his biggest regret in life, referred to 'the obvious'.
“Good question," he said. "One thing I should have done is a lot more thinking before acting. [There’s] the obvious..."
John has insisted he's a changed man from 13 years ago, admitting he would often rush into decisions without thinking.
“Sometimes you can make a decision too quick and that was my biggest downfall, but my father used to tell me that every day," he added.
"He said, ‘son, you react too quick, you’re not giving things enough thought. You’re jumping in…’ I’ve changed, but it’s all too late in life.
“I’ve had to, because I’ve got to bite my lip every day.”
John's passion is clear to see. He admits he wears his heart on his sleeve, while also insisting he won't dial things down.
“I’m passionate about everything that I do, even if it’s just painting the walls in my house," he continued.
“I want to get it done, blasted off. It’s the same with anything, you are what you are.
"I’m an outspoken man, I wear my heart on my sleeve.
“I say it how it is, and in today’s world there’s not enough people who say it how it is, ‘cause they’ve got to think of the job, they’ve got to think of what other people think… I’m not interested in that because money is not my forte.
"I’ve got a roof over my head, I’ve got an old car to drive, I’ve got a few pound in my pocket.
"I’ll say what I want to say.”
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John Fury is proud of everything Tyson Fury has achieved during his boxing career so far
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Fury, if he beats Usyk, will become undisputed heavyweight champion of the world.
John is proud of everything he's achieved so far, with the Briton also believing 'no man' is capable of beating his son.
“I’m not here to impress anyone. I’m just supporting my sons, and having a son like Tyson that’s a multi world champion, the best in the world, is incredible," he said.
"And then there’s Tommy [Fury], a very successful young man, in 10 bouts, worldwide fame.
"Other people might have a nice Range Rover, they might have a nice house, but they’ve not got what I’ve got – and that’s sons like these are.
John Fury has also hailed son Tommy Fury for his achievements in life
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"I’ve got six of them, they’re all fighters, every one of them can look after themselves.
"I’m a lucky man in a lot of ways.”