Know someone with road rage?

I would love to take this thing out on the road. Sure, it's slow. Let someone honk their horn. Go ahead, make my day.
The Land Walker, made by Masaaki Nagumo, measures 11 feet tall, weighs one ton, and sprays bullets from air guns mounted outside the cockpit. Ok, the bullets are foam. It's the thought that counts. I could imagine replacing them with paintballs.
It's really for sale in Japan. Only $315,000 (plus tax, tag, and title). If I put this on my wish list, will you buy me one?