When it comes from the crazy (and I mean that in the best way) and innovative folks at FAB Defense:
Looks like a regular hat, right?
What is this?
Turn it over.
It's a pretty ingenious device, and billed as non-lethal. While you might be able to gouge out an eyeball with the pointed ends, they're deliberately left dull. The gentleman at the FAB Defense booth was putting on a demonstration of how it works - the two prongs work together to trap an attacker's arm - and for someone who trained with it, it makes a decent defensive weapon. Considering that it fits inside a standard-looking baseball hat, and can be worn pretty much anywhere, you're likely to have this in situations where conventional tools would be discouraged.
It does get the ol' creative juices flowing, though. Imagine if instead of blunted plastic tips there were a pair of blades. Or spikes. Even if the existing plastic tips were, say, honed to more of a slashy edge, you'd have something capable of not only deflecting an attack, but allowing you to go on the offense once the threat has been parried. FAB was quick to advise against such action - they insist that this is a purely defensive object - but were equally quick to agree that the device could certainly function in that manner...
In any case, it beats harsh language, and it's something you can have with you pretty much anywhere.
That is all.