A rock makes a pretty substantial projectile.
It's usually been around a few million years and it's cheap.

Some people decide a smoother surface will have greater range and accuracy. Before you know it, people are shooting missiles across the Sea of japan.

And darned if some of our rocks don't turn out to to be coprolites.

Few things are perfect. We hope to balance imperfections with a redundancy of perfections.

Just understand your zippo is a rock.Sometimes it's best to have a pocketfull of rocks.