Mike Tyson has claimed that during the peak of his boxing career, he would sometimes punch people when they asked him to sign an autograph for them.
Of course, 'Iron' Mike used to be known for having a violent streak even beyond his 'Baddest Man on the Planet' tag.
He spent time in prison for rape, and famously bit part of Evander Holyfield's ear off during a bout.
But, the 53-year-old now feels awful about his behaviour and says that he lashed out at his adoring fans because he was unhappy.
He told Yahoo Finance: "My life was just miserable, I was out of control. I was fighting with everybody. If someone asked me for an autograph, I'd punch them in the face. I was just a mess."
Tyson, on top of the convictions we've heard about, was also arrested during his career for battery, sexual battery, misdemeanour assault, and assault with a deadly weapon.
It's fair to say he has a chequered past.
However, he now credits his life turnaround with - perhaps surprisingly - smoking cannabis.
Yep, he reckons that smoking weed sorted his mindset out.
Obviously, we're not suggesting that this is the way for everyone, but Tyson certainly seems pleased with the results he's seen.
He said: "After I retired, I started smoking. What a mistake that was.
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"I should have smoked my whole career. I should have smoked when I was fighting because it put me in this different state of mind.
"I'm very relaxed and the more relaxed you are, the better fighter you are, at least in my case."
He's also discovered psychedelics and has even started investing his own money into companies experimenting with the medicinal properties of psychedelic drugs.
Tyson explained how he took psychedelic substances in the lead-up to his recent exhibition match against fellow old-stager Roy Jones Jr.
He continued: "I think of it as an enhancer, it makes me better, even in the ring. The punches don't hurt as much, it has a lot to do with my comeback, the psychedelics."
There you have it.
In another interview, he talked about how psychedelics have completely shifted his life around.
So much so, that he reckons he'll 'never be the same'.
Tyson told Forbes: "You see how much my life changed five years ago? I was a junkie five years ago. I didn't even think I could survive. Then I got introduced to animal and plant medicine.
"Before you always read about me in the papers, doing something negative. Now, what happened to that guy? You don't see me partying anymore. That's not my life anymore.
"It's hard to really articulate it from my perspective, but psychedelics helped me assume my relationship with God.
"I don't use it for recreation, I'm not a recreational user.
"This stuff is only done from a spiritual perspective."
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