A cardboard tube makes a great bazooka. Heck, when I was little we even turned dirt into weapons. Dirtbomb!
We used pine cones as grenades!!!!
They became so good at this that they were able to embed metal objects deeply into tree trunks.
They finally told me this year (now that 2 are in college) the they had to learn to spackle and paint so that I would not know the damage they had done to the walls in the home. They said that they left a few places where you can still see the head of George Washington that the quarters would leave just to see if I would ever notice.