Twelve wedding guests were critically injured Saturday night in a dance-floor pileup blamed on new-versus-old Electric Slide confusion. 'The DJ called for the Electric Slide without specifying which, and when the 'old' Sliders slid to the right, they collided violently with the stationary, hip-shaking 'new' Sliders,' paramedic Laura Denison said. 'By the fifth bar, the dance floor was a gruesome tangle of bodies.' In the wake of the tragedy, the American Association of Disc Jockeys released a statement urging all DJs to specify which Electric Slide they are calling for at any future weddings, retirement parties, and bar mitzvahs. 