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"I can honestly say I didn't see it but Joe Simpson's nose looks like there was a head-butt, " he said.
BBC: 'Head-butt' compounds Quins woes
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Charlie Mulgrew was dismissed for an alleged head-butt on Kyle Lafferty before Rangers Madjid Bougherra saw red for a challenge on Jamie Langfield.
BBC: Smith upset by red card decisions
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Wasps director of rugby Tony Hanks insisted that the referee had no option but to send Robson off if he felt there had been a head-butt.
BBC: 'Head-butt' compounds Quins woes
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Wasps centre Steve Kefu had just fired a kick directly into touch when Robson became embroiled in an off-the-ball scuffle and aimed a head-butt at Wasps scrum-half Joe Simpson.
BBC: Wasps 26-15 Harlequins
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Hibbard prevented Tito taking a quick line-out and the Kiwi lock seemed to lash out at the Welsh international, who in turn seemed to head-butt the giant Blues star.
BBC: Cardiff Blues 12-16 Ospreys
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Winger Jean de Villiers was banned for two weeks for a dangerous tackle during the 31-17 loss on 17 July, and a week before that, Bakkies Botha earned a nine-week ban for a head-butt.
BBC: South Africa coach hints at refereeing 'conspiracy'
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The network's best known example of a nerd -- a fellow nerd girl, no less -- is "Daria, " the animated spinoff of "Beavis and Butt-Head, " which started in 1997 and lasted for five seasons.
CNN: 'My Life as Liz' and the evolution of the MTV nerd
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One of the writers of US comedy Beavis and Butt-head is among 18 authors shortlisted for this year's Waterstones children's book prize.
BBC: Beavis and Butthead writer up for children's book prize
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Then there's the show that introduced "Beavis and Butt-Head" to the world, "Liquid Television, " an anthology of experimental animation that aired in the 1990s that appealed to animation buffs.
CNN: 'My Life as Liz' and the evolution of the MTV nerd
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So, on a Friday night, shortly before its nine billionth airing of some episode of Beavis and Butt-Head, I got to make my national television debut alongside spasmodically obnoxious MTV personality Kennedy.
NPR: MTV, Kennedy and Me: Let's Begin to Heal
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Two other memorable shows that were launched off the success of "Beavis and Butt-Head" in the 1990s were "Aeon Flux" and "The Maxx, " both series with tremendous appeal among hardcore comic book and animation fans.
CNN: 'My Life as Liz' and the evolution of the MTV nerd