My existant toy can be put to a new use
Tailgaters flashing at you thinking when you're at least going the limit on two-lane road or on right lane of a freeway? d00d flash him back!
light It weighs about the same as a quarter.
light in action That's a picture of bathtub illuminated by this light in a pitchdark bathroom.
This is just as annoying as being flashed if not more for the flashers
I fooled around with it some friends and it seems to be adequately annoying. Got in my friend's car and had my friend go into my other friend's car which was parked in front of the one I was in. I had him flash the light behind through the rear window. It was farking bright and annoying. We switched spots since everyone wanted to experience what it's like to be flashed by this light by a car in the front. Everyone agreed it was just as bad as being flashed with high beam 

well now I can flash at tailgaters.
<< Mounting rear-facing lights like that may be illegal. >>
This is a handheld keylight with a damn bright blue LED powered by lithium battery so there is no mouting to be done.
Tailgaters flashing at you thinking when you're at least going the limit on two-lane road or on right lane of a freeway? d00d flash him back!
light It weighs about the same as a quarter.
light in action That's a picture of bathtub illuminated by this light in a pitchdark bathroom.
This is just as annoying as being flashed if not more for the flashers
well now I can flash at tailgaters.
<< Mounting rear-facing lights like that may be illegal. >>
This is a handheld keylight with a damn bright blue LED powered by lithium battery so there is no mouting to be done.