[Jameison]

"scum materazzi pinched so hard Zidane's nipple - Zidane had it and headbutt him. Watch the first video carefully."

Rubbish.
Won't wash
Zidane was walking AWAY from Materazzi with his back to Materazzi, before he turned round and head butted Materazzi.
Even if Materazzi did "pinch Zidane's nipple" earlier on, why on earth react to it a full like 30 seconds later when he was already jogging away from Materazzi?

Its like someone going to shoot some guy that insulted him 5 years ago, claiming it was done in the heat of the moment, and claiming manslaughter.

You either react to an assault at the time, or you don't.

[time4good]

Ok - a little extreme comeback you gave - so staying on point - think about it - guys playing hard - rough sport, other guy hard-tweaks your nip. It smarts (nature of it, no matter how big you are). You think - "ouch - jerk, " and then a few seconds later the macho factor of another guy tweaking your nip (which normal guys don't do) and it tweaks your head - only a few seconds later. Materazzi might have even busted him with words regarding it and, culmination of the moment, tournament and Materazzi's reputation that Zidane and others well know, and Zidane doesn't let it stand.

Stupid - YES, only explanation that makes sense. Unless Materazzi knew Zidane's mother or sister in some illicit relations.