Weapon safety.

A weapon is a weapon, no matter how it is shaped, formed, small or large. Weapons are designed to hurt people in many ways. Some break bones, others pierce skin, and others slice off the skin. That is why people use these weapons only under extreme circumstances, and only then with strict rules.
That is why you should treat every weapon like a loaded gun, that could go off and kill or hurt a person. That is why we have laws to prevent us from using weapons. These weapons can be used in many ways, all of which are different under circumstances. But frankly, any weapon is dangerous, so you should treat it as such.