A few years back a Kiai (chi body energy stuff) master put up $5000 that he could beat any MMA fighter in a no rules fight.  This master has a fairly large school with many students that believed what he was teaching was real and could actually help them in a fight.  A Brazilian Jiu-Jitsu purple belt (mid rank belt) took the challenge to some very amusing results.  This video illustrates why it is vitally important to train in systems that have proven their validly against other fighters.  Modern MMA is the premier was of doing this.  Muay Thai, boxing, Brazilian Jiu-Jitsu, wrestling, and various other arts when trained collectively have shown their effectiveness in combat.