Zidane headbutted an Italian in the chest cause the Italian started insulting Zidane's sister... While playing football
Zidane got red, and the other player got red after the game after they found the reason WHY Zidane did that.
Also, that would be, and was, Zidane's last match cause he retired. So that sucked as a last match for him
I remember that, it was like 4 pages in the newspaper the day after discussing WHY he did it..