Hollywood's Biggest Bad Boys
Credit: Fotonoticias/WireImage
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Johnny Knoxville
Knoxville has suffered "some concussions" and "many broken bones" as a result of Jackass' daredevil stunts. In January 2009, Knoxville was detained at LAX International Airport when security workers discovered an inert grenade in his carry-on; he was later released when they realized it was a prop.