What has always worked for me and my brother is we just get crazy mad, we never start fights we just end them, and for all the people sayn that a straight punch to the nose will give you the upper hand I'm not too sure about that it might or might not work i know i dont feel the pain at the moment (even though I've had my nose just dripping with blood a couple times) What I love to do is like what a couple of people have said get a full mount and just wail on him with the elbow pretty much just ends the fight, and I have no simpathy for the other person, if you wanna fight with me you better have friends to pull me off. Just my 2 cents.