08/22/2009 05:12 am ET Updated May 25, 2011

Michael & Michael Fist Fight On 'Late Night' (VIDEO)

Michael Ian Black and Michael Showalter went on "Late Night with Jimmy Fallon" to promote their new Comedy Central show yesterday. As expected, their appearance quickly devolved into name calling and slapping (and once "they" reappeared from backstage, intense fist fighting).


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