With all of the guns and projectile weapons in the world today, wouldn't it be cool to shoot something that doesn't harm another person. This video tutorial will show you how to do just that.
Check out these step-by-step instructions that show you how to make a smoke ring cannon. There's no need to fire bullets or fire, but merely smoke, which is tons of fun if you want it to be. Create the smoke with a mixture of ammonia and hydrochloric acid on a crumpled up paper towel.