Cat-Fu (猫拳パニック Neko-ken panikku?) is the 40th chapter of the manga and the fourth chapter of the Neko-Ken Arc. Ranma loses control after being around too many cats and the only way he can cope is to become a cat himself. He shreds the gym floor and Kuno's sword as if they were paper and then leaps outside and starts climbing trees and other cat-like things.