It's common knowledge that a rubber band can be used as a crude projectile, and YouTuber Dave Hax takes it to the next level in his office supply crossbow tutorial.
What's truly incredible about Hax's DIY office crossbow is how easy it is to make. The most difficult aspect about its construction is finding the five plus rubber bands you'll need to make your crossbow. The procedure is a simple matter of binding pencils together in the form of a cross and attaching an oversized paper clip to the base. The projectiles you'll use are pen refills found in any standard ballpoint pen.
While creating your own office supply crossbow is sure to delight your inner child, take care that you don't hurt yourself or anyone else.