You can lack acting chops and get by on attitude. Johnny Knoxville does it, but Dane Cook, as a lowly box boy at a superstore, stirs up trouble with genial indifference. He’s a rebel of passivity. There’s a crumb of an idea to setting a movie at a mega-mart that makes the Office Space cubicles look like executive suites, but the results in Employee of the Month are toothless. As a villainous cashier, Dax Shepard mugs with such vitality that it’s hard not to root for him. Memo to Jessica Simpson: You look peachy, but stop beaming about it.