like what if you were walking through new york's grand central station, and in the blink of an eye, nearly everyone around you suddenly froze in place? >> they stopped what they were doing and just stood like frozen. >> they're not moving. i can't move my cart. >> that's exactly what happens here on february 24th, 2007. grand central comes to a very strange and screeching halt. >> this is so weird. >> what is going on? >> i dent either. >> were you here from the beginning? >> no. >> do you know what they're doing? >> no. >> opened in 1871, grand central is the largest train station in the world. every day more than half a million people rush through the main concourse, a cavernous space filled with the frenetic hustle and bustle that seems to symbolize new york city itself. >> it's always packed with people. there are some tourists who may be taking photos of the clock or