most notably erik morales trying to switch in the last round of his first fight with pacman. you can actually see the punch that effectively ends his career if you watch it carefully, the life just pours right out of him.

if you are trained to fight left or right then by all means, go right ahead and do it, otherwise, dont even mess around with it. i dont switch in and out much cus i dont feel it offers much of an advantadge at all, some people can use it to great effect, like prince naseem or junior witter, who are trained to do it.

the southpaw/orthodox thing is one of the most overrated things in determining how to box someone. bottom line is a skilled righty should crush a less skilled lefty, or a super fast lefty should have no problems with a slow righty, but not because he is righty, because he is slow...