I remember reading a manga when I was in secondary school.
A badass kid lived in a village and ran miles a day, as the villagers tried, and failed to keep up with him. A band of arseholes attack the village and the leader challenges anyone to a one on one fight, which the kid accepts. The arsehole beats the shit out of the kid, making him bleed out of his orifices with the use of pressure points. The kid goes away, trains by doing handstands on one finger, then comes back and beats the shit out of arsehole with the use of pressure points.
I can't remember what it was called, maybe Brutal Child Abuse, but I'd like to see a film adaption of it...