This week Joerg busted out a deactivated M16A1 rifle (which he obviously has) and turned it into a slingshot. The launcher band mounts on the underside of the rifle barrel, and the weapon shoots two Cold Steel "Hide Out" neck knives aka really scary/sharp little suckers.
The slingshot can shoot two knives at once or one at a time. The best image from this video is probably Joerg testing the slingshot on a watermelon and then breaking it open to reveal the two knives inside. I wonder where The Slingshot Channel gets all its test fruit.