Weaponization of keys Keys make an excellent makeshift self-defense weapon. The "key knife" strategy is simple, easy, and intuitive to employ for self defense if assaulted. Keys can be used for self-defense by jabbing, slashing, or inserting into a lock. There are several different techniques for using keys as a weapon. Here are the most common: Jabbing - Using the side or bottom of the key blade to strike an opponent. This can be effective against a single target or in a group setting. Slashing - Bringing the flat part of the key down in a sweeping motion to cut someone. This can be done alone or in a group setting. It is best not to use a sharp key when slashing someone else's property, however. Inserting - Using the tip of the key to pierce through clothing and hit an opponent's skin. Be careful not to stab yourself with the inserting tool! These are just some of the many ways that keys can be used as a weapon. If you come across someone who has been using their key ring as a weapon, stop them immediately before they cause more damage than good.