The human body, like, especially meniscus. Like, like, you see the heel hook game. Like, everybody's involved in leg locks and heel hooks. Like, all those guys wind up with torched knees. Everyone's got torched knees. Everyone's knees are torn apart. And you don't grow new meniscus, you know, that's like one of those joints where, man, when it goes, it's, you know, those guys are 28 years old, blown out knees.