The one where Skallagrim subjects himself to getting thwacked with a steel cable:
What we have here is a self defense tool that relies upon “pain compliance” to get the job done. it’s unlikely to break bones and unlikely to cut very deeply when used as a whip, but it seems damned likely to hurt like a ᛗᚩᛏᚻᛖᚱᚠᚪᛣᚳᛖᚱ if used properly. A hit across the face seems almost certain to bring the issue to a close… and cause permanent blindness by chucking the eyeball across the room. Also demonstrated: the fact that whips go both ways… depending on followthrough, that thing comes back and bites you.
As mentioned in the video, the legality of such a device for the purpose of self defense is likely dubious in a lot of places. And thus when you look it up on Amazon, it’s being sold as something a little different than what it *actually* is:
Stinger Whip Car Emergency Tool (Black)
It’s for breaking car windows. Riiiiiiiiight.