All 20,000 fireworks lit the sky in 15 seconds when they were accidentally set off prematurely by a computer glitch at the San Diego Independence Day show, in San Diego July 4, 2012. The explosives were launched from four barges in San Diego Bay and from a pier. The fireworks, all 20,000 of them, went off five minutes before the show was supposed to begin and thousands of disappointed spectators were told the display was over. - REUTERS - 6 July, 2012