This video is worth sitting through. It is recorded by a young couple in NYC from shortly after the first plane hit until the collapse of the second tower. It has been called the best single roll video of the collapse of the towers and will bring back the emotion and banter of that day, for most of us, of personal infamy.
For those who want to see what it was like, I recommend the film 9/11 which ran on CBS Television without commercials and earned international acclaim. A documentary about a "probbie" fireman ended up to be the only film to show the planes actually hit the Twin Towers, be with the fire chief in the lobby of the towers as bodies fell on the roof, and many other first hand and terrible events of that day.