A crazy watch. Two brothers are making a documentary on rookie firefighters in late 2001. The crew goes out to look at a possible gas leak, a loud plane is heard, the camera pans up, and the North Tower is hit. It was one of three recordings of that hit and the only clear one. The rest of the documentary follows the crew into the towers. No one knows what's going on, the scenes are chaotic but also calm as the firefighters try to figure out what to do. Then the second tower falls while (one of the brothers) is in the first. One of the most incredible things I've ever seen.
I think it was well known when it came out, but it's been overshadowed especially since searching "9/11 documentary" gives a million results. If you want to see one of the craziest human experiences unfold in front of you, there's no other film like this.