Didn't work on me yesterday... The other students were laughing because I just sat there expressionless as guys were digging their fingers into the pressure points under my jaw and nose... That's what happens when you have a huge muscular neck... The nerves are under all that muscle I guess... It took the instructor to make me tap out finally, but that shit would never work in real life on guys like me... I think a high pain tolerance from bodybuilding helps also.