B: Zidane headbutted Materazzi, but why did he do that?

齐达内头顶了马特拉齐，他为什么要这么做？

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The veteran Italian headbutted Jordan as tempers flared at full-time in Milan 1-0 Champions League .

BBC: Gennaro Gattuso given four-match ban for headbutt

The exchange had still seemed innocent enough until Zidane inexplicably headbutted the Italian defender in the chest.

CNN: Zidane sees red as Italy win Cup

In 1991 he received a two-year conditional discharge for assault occasioning actual bodily harm after he headbutted a colleague.

BBC: Philpott sentencing: Derby fire deaths duo 'good' parents