A Whip
This is no ordinary whip used for flogging or whatever other stuff people do in the privacy of their own homes. This one is covered in blades and would certainly hurt anyone on the other end of it a lot.

We do not recommend trying this out for those of you who are into that sort of thing and don’t get us wrong, we’re not judging you, we’re just looking out for your safety. Imagine the kind of damage this could do if it was flung at your body? We shutter just thinking about it and we’re glad the TSA took it away for good.