Self-injury

Self injury is what happens when someone is stupid enough to get themselves hurt. In most cases they directly cause the injury, but in other cases it is because their stupidity irritated someone else enough to hurt them for them. The latter type of self injury is especially common in HQ and in Anhk-Morpork.

Some wangsty Mary Sues injure themselves, usually by cutting. In Real Life, this can be a sign of severe depression† and no trivial matter.

†General information can be found here.