Re: High Beams
When people forget to dim it is pretty standard practice around here to briefly flash high beams at them. That polite reminder usually works.
A pair of Oscars or Lucas Flamethrowers (aftermarket driving/offroad lights) flashed very briefly will get anyone's attention, but. . . . that is dangerous for two reasons.
1. They may blind the other driver sufficiently to cause a crash.
2. The other driver may be a LEO, who will promptly bust you. Of course, if you are the one who has neglected to dim the LEO may bust you anyway.
I no longer drive at night, so "Ole Blue" doesn't have the Oscars anymore and the problem of inattentive (rude?) drivers is a thing of the past for me.