Fit to Survive is a YouTuber and maker of custom survival gear for everyday carry. Years ago, he restored a few Swiss Army knives and realized that he could improve upon their designs. He modified them in practical and sometimes fanciful ways.
I'm not sure which category this particular knife fits. A crossbow is not a standard tool that folds out of a knife case. But this tool is so precisely engineered and machined that it's functional as a weapon under unusual circumstances. With a carbon fiber bolt, it's able to puncture a soda can.
I wonder if it would be possible to add a ghost ring sight to improve accuracy of fire.
-via The Awesomer

