Friday the 13th.

No black cats. No spilled salt. Not to be a jinx or anything, but so far, so good.

But if your luck doesn’t hold, you can always rely on your fists/cell phone case.

Presenting the Knucklecase, which instantly converts your iPhone into something you wouldn’t want to meet in a dark alley. Unless, you know, it was really dark and you had one of those flashlight apps. But otherwise, look out.

It’s forged in such a way that it fits snugly around your phone, while letting you slip your fingers through four holes on the side. Yes, we’re talking about a set of solid brass knuckles for your phone. Okay, so it’s not actually brass. It’s aluminum. Aluminum knuckles for your phone. Well, slightly less scary there. But still, just let someone try and say that to your face.

The case was originally designed to help prevent phone theft (think of it as a more menacing cousin to the belt clip), but we could see you using it for many other functions. Like extra jewelry when you’re visiting the Jersey Shore this summer. Or, you know, as the official case for that high-stakes, full-contact Words with Friends league you’re starting.

Alec Baldwin is a dead man.