Materazzi clearly said something "very serious" to Zidane. We won't know until Zidane speaks out but we can all see how serious it could have been for Zidane in his final game and in World Cup final to head butt like that, to disgrace himself in front of millions of fan watching the game all over the world. What caused the talisman of French football to commit such act? Does this explain something : http://www.youtube.com/watch?v=EpG4AHlZrL4&search=materazzi