Chairman Mao wrote:

I had one of these self-styled 'ninjas' who, incidentally, weighed about 350lbs, so I doubt he'll be flying through any treetops anytime soon, show me his dremeled, mangled 'ninja sword', which he had attempted to serrate himself. He said this was the proper way. I later had the unfortunate honor of watching one of my friends try to 'learn' from this guy. Every ounce of power his freakish strikes might have had leaked right out the malformed hip placement, and the footwork looked hurriedly boosted from "Street Fighter II". As you might guess, I don't put much stock in Ninjitsu, due to some rather rotten experiences.