Have you ever thought of making your own cannon during a Nerf war? Well, I recreated an invention that I made when I was about 8. This invention is called the pressure gun. It is very easy to make, however, it is a hassle to load, and hard to fire long shots. All you need is paper, those tubes you find with a paper towel roll, Duck Tape, and a gallon sized sealable bag. Just cut a hole big enough for the tube, and seal the hole for the tube with the Duck Tape. Now just blow a large amount of air into the bag from the tube, stick a crumpled ball of paper in the tube, and finally hit the bag so that all the air rushes out and fires the the paper.
**warning** Do not aim at head or face.