Multipurpose pen light, cap light, glass breaker, writing implement.
One of the best little tools ever. It's a light, glass breaker, cap light and ball point pen.
It slices. It dices. Actually those are a couple of things it won't do. But in a real tough situation it is nice to know that the pen in your pocket can get you out of a dark room in a blackout. Or clip on as a cap light to change a tire. Or break into a car door side window for a rescue.
It's just handy to know that you are prepared.