Dave and Chuck the Freak

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PITTSBURGH, PA - SEPTEMBER 24: Pittsburgh Steeler fans cheer on their team during the NFL game against the Cincinnati Bengals on September 24, 2006 at Heinz Field in Pittsburgh, Pennsylvania. The Bengals won the game 28-20. (Photo by Greg Fiume/Getty Images)

Two Pittsburgh Steelers fans were arguing toe-to-toe in the stands on Sunday when one of them headbutted the other, knocking him out of the picture. 

Other fans try to get in the middle . . . but then the headbutted guy comes back for more, and this time the dude punches him several times.  The entire area turns into a small scrum until security arrives.