The Head-butt heard around the world

Did anybody see this on Suday?? We were watching the World Cup Finals with some friends and this was possibly the most exciting part of the whole game! Everyone's all abuzz with "What did the one dude say to the other dude that made him so mad he wanted to ram his head into the guy's chest?" Soccer hooligans are the best, I tell you. I'm surprised there weren't riots! Watch the video here if you haven't seen it and weigh in on Zidane's technique...http://www.youtube.com/watch?v=j1i_l0OeeMc