With the growing popularity of Mixed Martial Arts and the rise of UFC, two people beating one another to bloody pulps is once again mainstream fare. While MMA is no doubt a brutal sport, there exist far more dangerous—and arguably even insane—forms of combat athletics. Take, for instance, the wandering bands of Irish gypsies who engage in no-holds-barred bare-knuckle boxing, where the only rule is “whoever gives up or passes out first loses.” And that’s just the tip of the irrationally violent iceberg. Check out what our brothers at Cage Potato have written about the seven most insanely dangerous combat sports.