new york city, july 18th, 2007. it's just before 6:00 p.m., and the evening rush is in full swing. millions of workers are making their way home after another busy day in the big city. on 41st street and lexington avenue, the heart of midtown manhattan, 21-year-old gregory mccullough, college student and part-time tow truck driver, and his passenger, judith bailey, are stopped at a traffic light. they are in the wrong place at the wrong time. >> we were just having a casual conversation about, you know, life and things, our aspirations. the next thing you know, i hear boom. >> a surveillance camera shows what happened. the top of the screen, out of nowhere, the street explodes as