UFC/MMA is scary. Joe Rogan describes mixed martial arts as high-level problem solving with dire consequences. There have been deaths in the UFC:
Boxing: In 1982, South Korean boxer Kim Duk-koo wrote “Live or die” on a lampshade a few days before going into the ring with Ray Mancini. He died of head injuries. Mancini blamed himself and Kim’s mother committed suicide, as did the referee of the bout, Richard Green.