It was previously posted:

>*Welcome to the new world!* =(
>If you see any car driving without their lights on (at night) DO NOT blink
>your lights at them. Even though you might be thinking that you are doing a
>good deed in desire for saftey, you are, in fact, placing yourself in
danger.

>There is at least a 50% chance possibility that you may find yourself the
>target of a gang initiation. It seems that some gangs initiate new
>"shooters" by trolling in traffic with their headlights intentionally left
>off. Their goal is to wait until some well intentioned citizen blinks their
>lights at them intending to add to the safety factor. The good samaritian
>ends up in the crosshairs of the newbie shooter. 

This is an urban legend hoax.  You might want to check out:
http://www.urbanlegends.com/