(noun): Permanent reminder of one's temporary insanity.
I had a friend who's son died in an accident. She grieved but her daughter in law, in her words, went "stark, staring, bonkers". Granted DIL did not expect to be a widow with three children before she was thirty so there was some justification.
DIL decided that she wanted to show her grief by having her dead husband's face tattooed over her heart.
We managed to talk her out of it and into a small broken heart bracelet with his name inside.
I am fairly sure DIL's second husband appreciated it.