Idea: a USB-controlled gun, but the USB protocol implementation is the most cursed part.
Any ideas? I have a better one, but I'll start with that it's a USB printer class. Every time you tell it to print a page, it fires
@foone the mental image of someone at a gun range, furiously yelling BANG into their mic as they aim downrange, while their friends quietly snicker and point to the unplugged cable