Some dude "brake checked" me about 18 months ago. Scared the crap out of me! After this incident I immediately bought a dash cam so if this happens again I won't be a victim. The model I bought actually straps onto your rear view mirror. Since it's disguised as a mirror, you never have to take it down.
Here is the link:
Some day I will be upgrading to a 4k dash cam but it seems like most are still only 1080p resolution?
Definitely don't cheap out and get a 720p dash cam, it's way too hard to read license plate numbers!