Reflex is a natural and spontaneous movement which seems devoid of moral content because it does not depend on the subject’s responsibility. It is what is beyond control of the body and civility of morals. A bad reflex occurs when the body reacts too quickly, carried away by anger or by the situation faster than by reflective consciousness: the time of the living body is ahead, by motor anticipation, of the time of the lived body’s consciousness. Reconsidering Zidane’s headbutt, a bad reflex in reaction to his opponent’s insults in the final of the 2006 Football World Cup, using insights from Georges Canguilhem, will show how nervousness, from Descartes to modern electrophysiology, serves as an argument to a neurophysiological causality of bad reflex.