This lady had followed us for a few miles in slow traffic. I had seen that she, for some reason, seemed upset and was gesturing and giving me the finger. Then this happened.

Luckily, no one was hurt, but I was worried that she'd do something similar again with a worse outcome, so I called the police. They seemed completely uninterested, even when I told them the video and the licence plate number. ¯\_(ツ)_/¯