It's never happened to me; but, there have been reports that if your 'spirit' (I think) resistance is too low you may end up turning into a frog. <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
That's why we were hopping and croaking around. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />