I just realized it this morning.
One of my friends promptly asked me, after I told her about this, why I would need a grappling hook?
Here is my reply, exactly as I wrote it to her: I don't know. I'm sure a perfect use for it though will come up at some point in my life. Hopefully with other people around. So when it does I can say, "Brb. I got this." Then return with a fucking grappling hook and blow their goddamn minds!