French soccer players don't like Yo Mamma jokes

On Sunday, Sarah (French) and Mario (Italian) hosted a party for the FIFA World Cup final. They started by serving a delicious homemade lunch (paprika chicken, potato dumplings and tiramisu). And then we watched the match... Italy won via penalty kicks. The most dramatic moment was when French captain Zidane head-butted a guy from the Italian team and got thrown out of the game. We're dying to know what provoked him.