The former Fall Out Boy bassist had a scuffle with a heckling fan at a 2008 acoustic gig in Chicago. Wentz apparently pretended to laugh it off when the fan repeatedly interrupted the set to mock him for being a sell-out and make disparaging remarks about his then-wife Ashlee Simpson. But when the band left the stage after the set, Wentz expressed his feelings in a more tangible way. The offending fan was found on the floor bleeding from his nose and ears. —Jeff Royer
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