Michal Kosakowski splices together scenes from a bunch of different movies to recreate the events of 9/11. It was based on the usual first reaction of witness to the tragedy, "It's just like the movies."
I think it is about 20 minutes long, and it is really well done:
http://michalkosakowski.net/wp-content/uploads/films/JustLikeTheMovies.html
From http://kottke.org/
