Crazy has worked for me at least twice. In school i had someone threaten me with a razor blade, i was like wtf are you going to do with that? i grabbed another razor, there was a box of then there( voc tech school..which explains alot right there.lol), and cut myself a bunch of times, "if i do it to myself, you think i give a shit about you cutting me?" Later, I had this punk pull a knife on me in a bar, i took my knife out of my pocket, threw it to the side, put a crazy smile on my face, looked him in the eye and just said "you better make the first one count, casue i'm going to disembowel you, alive, if it doesn't ." he backed down pretty quick.
Come to think of it, the people i roll with, we're all a little crazy, makes me remember the time my best bud got sucker punched in the face, he turned looked at the guy, called him a pussy, then punched himself in the face giving himself a bloody nose..lol..same guy that had a gun put to his head and all he wanted was to know what type of gun it was and if he could hold it, ended up becoming fairly good friends with the guy that pulled it on him because of how he handled it..