ETA: Other.
When I was a pizza delivery guy, I carried a 2 million candlepower spotlight beam in my car for the purpose of identifying house numbers in my rural area late at night.
My response to unrepentant hi-beamers? (the ones who didn’t turn them off after being politely flashed with my lights) I pulled out the spotlight and blinded their ass immediately as they passed me. It only takes a couple second burst of photon POWAH!! If they crash, I don’t care. Fuck you and your high beams, blinding me with no concern for whether I can see the road after you pass and my night vision is all ruined.
I have an eidetic memory, so it made for some lovely images of the faces of the drivers when they got flashed 