When driving at night, I frequently encounter people who don't dim their brights. It's the same deal each time -- I wait until they've been blinding me significantly longer than they should have then I flash my brights once as a reminder in case they forgot.
Somewhere between 1/4 and 1/3 of the people don't respond to the reminder. So I give another flash. Practically no one responds to the reminder. After that, I just switch my brights on completely -- at this point, I get 100% compliance and the instant they dim, I turn off my brights.
What's going through these peoples' minds? Why do they wait until someone screws them over before just doing the normal thing? I can't be the only one willing to blind jackasses who won't respond to a gentle reminder.