I can’t find a decent explanation anywhere of why the #1 soccer player in France would headbutt another player in the final moments of the big game. This is as good as any: “the lofty hermeneut within me saw it as the supreme existentialist gesture—le grand refus—at the very moment of being inducted into multicultural sainthood by Chirac.” Barry Yourgrau: Oh, Zidane, Zidane, What Have You Done?
BTW, video (the only source, thanks to the uptightness of FIFA) is here in a highlights clip, about 1’30” from the start.