Instead, Zidane was dismissed from the field for headbutting Materazzi, apparently in retaliation to some verbal insult offered by the Italian defender.

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John Tomic is facing criminal charges after allegedly headbutting his son's training partner Thomas Drouet earlier this month, though he is claiming self-defense.

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The leader of the English Defence League (EDL) has been convicted of assault after headbutting a member of his group during a rally in Blackburn.

BBC: EDL leader Stephen Lennon convicted of assault

Lock Bakkies Botha was banned for nine weeks for headbutting New Zealand half-back Jimmy Cowan in South Africa's opening match 32-12 loss, while Jean de Villiers was banned for two weeks for a dangerous tackle on Rene Ranger in the first half of his side's 31-17 defeat by New Zealand on 17 July.

BBC: South Africa centre Jaque Fourie handed four-week ban