Fighting like a bitch at first will usually give you openings you can drive a truck through. If they land the first shot, fall to the floor and start twitching. As soon as they turn, smash them in the small of the back. Or put up your hands like you're going to box, but then kick them in the balls. Scream that you're a hemophiliac. That used to actually work before they did it on the Simpsons. If you do bleed, though, say "Oh no, I'm HIV positive."