Now I am not judging this guy on whether his techniques are valid or not, you guys can be the judge of that. I will say the guy seems legit and serious about his craft and does have some very relevant videos for self-defense.
The one thing for sure I can tell you is this guy is hella-FUNNY to watch. I think a big part of it may be his weird Chinese/British Cockney accent combined with his facial expressions as he kicks his poor victims in the balls.
Here are a couple of his videos that I found funny.
Stay Alert, Stay Armed, Laugh Often and Stay Dangerous!