Have you seen the Xbox game called Assassin Creed? The main character uses a fully functional arm mounted grapple hook. We all think these gadgets and hidden blade is something as fiction but Youtuber ColinFurze have managed to bring them to life and its awesome.Here's how it works? Insert CO2 cannister, point to destination, and fire! Once the grapple-hook is secure, attach the harness tether to the rope launcher. This has also got the switch on it that controls the motor. Now winch yourself up. See the action here.