Actor George Clooney poses backstage after receiving the Bob Hope Humanitarian Award at the 62nd annual Primetime Emmy Awards in Los Angeles, California, August 29, 2010. REUTERS/Danny MoloshokReuters – In the battle of the box office assassins, A-lister George Clooney barely mustered more firepower with his new chart-topper „The American” than the relatively unknown star of „Machete,” as the summer moviegoing season wrapped feebly during the Labor Day holiday weekend.