Art of the KO

I was watching a youtube clip from Richard (from Street Fighting Secrets) the other day talking about the best way to knock out an opponent. In the video Richard tells us not to believe what he has to say but to search youtube under "knock outs" and see the type of strikes that successfully knock people out. Doing this is very enlightening, as a matter of fact you should go and do this now. Watch boxing knockouts, MMA knockouts and street fighting knockouts and as Richard recommends look at the tool that was used (punch, kick, knee, chop, etc.). Also look at the target being struck and the angle of energy transfer and also the intensity.

Here's some links to get you started:

right punch to jaw
left hook
flying knee
knock out kiss
knife hand (shuto)
knee
headbutt
elbows (lots of elbows)