This is so funny.
A local Palos Hills instructor here in Chicago, nicknamed the "Human Stun Gun", who is a 7th degree black belt under uber con man George Dillman, tries his Dim Mak jerkofism on the local Gracie BJJ/MMA team under controlled conditions and fails.
Notice that Stephan Bonnar is one of the students who he is trying this out on.
http://www.youtube.com/watch?v=qa1nzD-n25Q