They're not quite harmless. I've got a nice scar in my eyebrow from one, and I've seen them remove pieces pavement. With just a little more evil thought than

They're not quite harmless. I've got a nice scar in my eyebrow from one, and I've seen them remove pieces pavement. With just a little more evil thought than I put into it when I was hacking around, I could see them hurting people.