In the opening segment of the episode, Theroux asks the 34-year-old: “Can I see your hands? Are those little marks from boxing?”
“Well, this one is,” Joshua replies, before Theroux adds: “What about on your knuckles?”
“You know, funny enough...” Joshua begins. “I’m not a troublesome person, I’ll be honest with you – far from troublesome – but I used to get in fights, and my skin hasn’t healed too well.
“So, this knuckle... I was going to get chicken one evening, and I ended up fighting six guys on my own. And that was just like massive – really good scrap. And I think this [one] is from the same time.”
When asked if he ever put anyone in hospital, Joshua replies: “No, no, no, no. In a coffin. No, I’m joking!”
Much of the episode focuses on Joshua’s points win over Jermaine Franklin in April, when the Briton bounced back from two straight losses to Oleksandr Usyk. AJ has since fought again, knocking out Robert Helenius in August.
Louis Theroux Interviews: Anthony Joshua airs on BBC Two on Tuesday 7 November, starting at 9pm GMT.