Have you ever been in an office situation where you absolutely had to perform violent physical mayhem on someone but didn’t have a weapon handy to do it with? Holy coincidence us too! Well, we’ve got you covered.

Meet Joerg Sprave. Obsessed with slingshots from a young age, Sprave has tons of YouTube videos showing off his excellent weapons. Now he’s showing you how to put some together out of simple things that you’ll find around your cubicle.

The pencil shooter allows you to rocket sharpened writing implements into the skulls of your foes, and the other inventions in this video are equally deadly.

Hot tip: if Sprave walks into your office, excuse yourself and hide in the bathroom. Also, use your white underwear as a surrender flag, assuming it’s still white.