Joerg Sprave excels at engineering bad*ss slingshots. In the past he's designed a slingshot for sawblades, one for machetes, one with a rifle scope, and a slingshot that's more or less a portable guillotine to be used in a zombie apocalypse. His latest creation is a pump-action slingshot crossbow that fires 20mm steel balls. And it's a lot of awesome.
via his description:
The weapon can be loaded with 20 "rounds" within just a few seconds. Then, a simple racking action feeds a round into the chamber and cocks the bands. The weapon is used here to smash eight glass bottles, which is done in one uncut passage with just six shots.