T.I. took a hard-hitting turn last night on Late Night With Jimmy Fallon, delivering his song "Ball" with no frills beyond the thick gold rope around his neck. Clad in a gray sweatshirt and baseball cap, the Atlanta rapper flung his rhymes with enough physical force to carry him back and forth across the stage while the Roots and a hype man helped flesh out the lead single from Trouble Man: Heavy Is the Head.