It's 8:40 am and the Sheraton Hotel ballroom thunders with the sound of plastic explosives pounding against metal. No, this is not the Sheraton in Baghdad, it's the one in Arlington, Virginia. And it's not a real terrorist attack, it's a hypothetical one. The screen at the front of the room is playing an advertisement for "bomb resistant waste receptacles": This trash can is so strong, we're told, it can contain a C4 blast. And its manufacturer is convinced that given half a chance, these babies would sell like hotcakes in Baghdad — at bus stations, Army barracks and, yes, upscale hotels.