CHICAGO, IL  [Thursday Jun.14.2007]  /Mix103FM.com/ -- Fall Out Boy's Pete Wentz got into a fight with a fan during an acoustic show in Chicago this week.

According to Rollingstone.com, the band played 4 songs before the fight broke out with the heckler, who was described by a witness as a "250 lb. meathead-looking guy." She said, "When the crowd parted, you could see [Wentz] on the floor face down. Then his body guard grabbed him and hustled him out the door."

Another witness reported seeing Wentz's bodyguard punch the heckler. The source said, "I could see the band's bodyguard because he's huge."

"We saw him punch [the heckler] – it was like a movie."

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