I have one. It’d be a bit cumbersome in a hallway, plus ricochets are a bitch.
http://www.youtube.com/watch?v=OIuNNrboewU
Ouch! I think that would be a fun toy, but I don’t live in the right area for it to serve a real purpose. I may buy one if Pelosi and Obama are trying to ban it, but otherwise, I can’t see getting one.