I wouldn't say using pencils as zombie-killing projectiles would be my first thought, but if you do enough slingshot-ing I guess it makes sense that you would eventually run up against office supplies as a source of inspiration. Joerg updates his pencil shooter to be crank operated and more efficient. It can shoot two pencils at a time for a total of 16 in one magazine. And Joerg sees potential for use with a power drill instead of "muscle operated action" aka humans. Leave the pencil shooter going while you run away from the zombies. Solid plan.