What Materazzi said to Zidane

The big question of the World Cup final was what exactly did Materazzi say to Zidane to provoke the headbutt that resulted in Zidane being sent off?

All has now been revealed by Materazzi himself. Materazzi was tugging on Zidanes jersey a challenge which led to the following exchange:

Zidane: If you want, I'll give you the jersey later.
Materazzi: I prefer your sister.
Zidane: -headbutt-
Materazzi: -falls on ground like a man shot-

Bit dull really.