Heard about a Chinese martial art called Dim Mak on a show where they showed someone knock people out only by touching them.
At first I thought to myself, "Nah! Can't be real. They seem to be faking it."
So I googled it and found some interesting stuff.
The Science Behind Dim Mak by Dr Michael Kelly
Dim Mak and Acupuncture by Paul Brecher
Dim Mak Point Strike Applications From The Taijiquan Chi Forms
Need to revisit this when I get the time.