that actually happened according to my friend (huge super hero freak). They had a comic about Batman vs. Superman, bat had a kryptonite ring on his finger and punched superman till he won. Dammit. Batman never loses.
if that were to really happen, superman would fly cirles around him and throw something at him faster than a bullet from like half a mile away. The man isnt an idiot, he obviously wouldnt face a guy holding onto kryptonite in a fist fight.