This is an amusing video from a Chicago news program of a Dim Mak (death touch) master that claimed he could use pressure point attacks and chi (touch less / body energy) attacks on opponents.  In his dojo he was able to illustrate that his moves worked on people that believed that they would work.  The reporter then took him to a Brazilian Jiu-Jitsu school to see if it worked on fit men that didn’t believe it would work.  Needless to say it was 100% useless against a BJJ fighter.  If it wont work in the ring it wont work in the street.   It is always good to be skeptical of any so called master that doesn’t have a winning fight/competition record or has produced a winning fighter/competitor.