The current Superman thread got me to wondering about costumed crimefighters in general. Has anyone heard or read of anyone in real life attempting to actually be a vigilante type? With all of the folks in the world who are a little "off-kilter" I'm surprised we haven't heard of someone dressing up and trying to apprehend criminals on their own.

Or maybe they have and were blown away for their efforts early in their career. I can't imagine someone lasting very long if they tried to be a real life Zorro, Batman, or Green Arrow.