A Credit Card Knife?

I received an email the other day informing me that I had won a 'Free Credit Card Knife'.

'A what?'

There was a gif running inside the mail showing how it works. It's shaped like a credit card, so can be put inside your wallet and then you can twist it around to create a knife when you want to use it.

Crazy.

And scary, when you think about it.

I obviously don't need anything like this. I know there might be people out there who could see the benefit of having something like this (camping)  but the bottom line is I think these things can get into the wrong hands and be used for other purposes.