Charlie Sheen opened up about the surprising secret he shared with O.J. Simpson after running into him at age 10. In a passage from The Book of Sheen: A Memoir, which was released on Tuesday, September 9, Charlie, 60, recalled crossing paths with Simpson while joining his father, Martin Sheen, on set. "During a lengthy break between production set-ups, I got into a heated and surreal game of ping-pong with that same man by his other nickname, The Juice," he wrote. "O.J. was extremely competitive and clearly didn't give a f*** that his opponent was a shy ten-year-old child.