One thing for us all to remember, especially those of us with modded headlights, is that when and if we do flash someone (that just sounds funny) that it needs to be quick, especially when done after dark. During the day it isn't too bad, but after night if you flash someone and hold back on the stalk for very long or just put them on high beam until they get the message, you not only have become an a-hole yourself, but you have also caused the other driver to be blinded by 4 or 6 lights that you've got blasting right in his face. Flash to warn people of things you think they should be aware of, but just make it quick enough that they can see it but don't see spots, they'll appreciate the gesture a lot more that way.