Mystery Solved?

I was tugging his shirt, he said to me 'if you want my shirt so much I'll give it to you afterwards,' I answered that I'd prefer his sister. It's not a particularly nice thing to say, I recognise that. But loads of players say worse things. I didn't even know he had a sister before all this happened.

--Marco Materazzi, on what he said to Zinedine Zidane that got him so riled up.