If you're looking to score major cool points, it wouldn't hurt your rep to buy a gun knife. You don't even need a permit to carry around this firearm because as it turns out, it doesn't fire at all -- that doesn't mean you're not dangerous with it on hand though.
While this knife looks cool, it's still incredibly functional. The knife works for just about everything you would need an ordinary knife for and features a good-sized stainless steel blade. The trigger on the gun acts in the same way a button on a regular retractable knife works, launching the blade quickly and sharply into the upright position.
The gun knife is great as a tool and even better if you're trying to show off with it, providing instant cool points.