Whether gathering the family 'round to marvel at the sheer Coors-can-devastating force of Busty Heart's exercise-ball-sized melons , or simply gasping in amazement as octuple-jointed youngster Victoria braids her limbs into a human challah bread, you never quite know what form America's talent will take on America's Got Talent . On last night's show, for example, we were treated to that Las Vegas showroom mainstay—the celebrity impersonator—effecting the guise of addled Godfather of Metal, Ozzy Osbourne. So chillingly spot-on was the performance that Ozzy's own wife, Talent judge Sharon Osbourne, admitted not even she could tell the impostor from her own husband. She then insisted he drop his pants and proceeded to examine the contestant thoroughly; satisfied he bore none of Ozzy's distinguishing cigarette burns or The Catheter Bag of Darkness, she was happy to move the doppelganger onto the next round of competition.