Hey, that's something I've never seen on a pocket knife. Huh. They do have an outdoorsy application too, you use them to flash light at planes in a worst-case type deal when you're lost in the woods. If that ever happened other than theoretically, I bet a lot more pocket knives would have mirrors. I suppose they expect you to use the shininess of the blade. But that seems as though it would be a bit awkward for the purpose of showing a girl her reflection. Unless it's a girl who likes knives, but that's something you ought to be sure you know ahead of time. So, my contribution is: Showing a girl her reflection in a knife.