In Step Brothers, the prolific producer Judd Apatow (The 40-Year-Old Virgin, Knocked Up, Forgetting Sarah Marshall) pushes his prevailing theme of male arrested development as far as it can conceivably go. This tale of two 40-year-old men who become stepbrothers when their single parents marry consists almost entirely of watching Will Ferrell and John C. Reilly behave like horribly spoiled 12-year-olds. To call either one a man-child gives children a bad name. ...