Well I have parts two and three to go before I think about the one where he took on a female student and the Jackie Chan remake of it. I know in that particular fight, he kicked one of the kids in the crotch. As far as catching flies with chopsticks goes, I doubt that Ralph Macchio actually did that; but if the weather is at an uncomfortable enough temperature for flies, it probably wouldn't be difficult to pick one up. I remember learning about that in fourth grade, but anyone trying very hard to catch flies with chopsticks would have too much time on their hands.
Take care and God bless