A brilliant film that helped define a genre

I was totally surprised at how great this film.You could feel your paranoia rise as the film went on and as you gradually learned the details of the real situation.

All that we are seeing on the screen is happening with real people, real action sequences in the background, forcing the eye to watch as if we were there.

All of these films share one commonality, that being a kind of emotional center that humanizes a cast of monsters.