Joerg Sprave — "CEO of a mid size consumer electronics company located in Kronach/Germany" — makes homebrew firearms out of rubber bands, wood, and various and sundry materials, and features his creations on The Slingshot Channel.
Sprave has quite a varied and busy life, it seems: he's a prolific author, a weightlifter, a motosport rider, and a fountain-pen collector. But when he's not doing all those things, he's having an ungodly good time in front of a camera operated by his "beloved wife Tanja," showing off his insane inventions, which he refuses to patent ("I have no commercial interests, therefore I do not need patents.")
Case-in-point: the Full Auto Coke Bottle Gatling, which uses repressurized Coke bottles on a disc attached to a motorized screwdriver that drives them around and around, past a dingus that releases the pressure valve and fires the arrows.
This is a fellow who is seriously overprepared for the zombie apocalypse. For my money, he's a much better Sunday entertainment than the Superbowl.