headbutt
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9
Anthony Johnson vs. Alexander Gustafsson
<iframe src="https://www.youtube.com/embed/fhog6dnd8KU" allowfullscreen="" frameborder="0" height="315" width="560"></iframe> and for the headbutt debate <iframe src="https://www.youtube.com/embed/aq4rH1G127M" allowfullscreen="" frameborder="0" height="315" width="560"></iframe>