He has a tattoo of Chairman Mao on his bicep.
In a 2010 interview with GQ, Tyson admitted that he used to get in trouble in prison on purpose so that he could be by himself and read things written by the former Chinese communist leader. "I read his book when I was in prison," he said. "Down in the hole. They thought they were punishing me in that little room-no toilet, no bed. I got myself put down there so I could read Chairman Mao and not have to deal with all that prison bullshit. The thing that stuck from his Quotations book: 'No investigation, no right to speak.' If you aren't going to look deep, just shut up." Wow, deep.