Imagine you are tied to a chair with your hands tightly bound behind you, preventing you from covering your ears. Before you is a giant chalkboard. A woman enters the room. Her fingernails are long, hard, and ready for attack. You follow her with your eyes as she saunters to the chalkboard and raises her hand to make a claw. She looks at you with a blank stare as she digs her fingernails into the chalkboard and drags downward. As the harsh sound hits your ears, you squeeze your eyes shut in an instinctive yet vain effort to shut out the noise, but the absence of sight only magnifies the vile sound. Your ears have become hypersensitive, and you feel an unpleasant chill shoot through your body down to the toes of your feet. Finally, the sound stops as she removes her nails from the board, and a wave of relief passes over you. But the reprieve is short-lived. Again, the nails dig into the board and screech all the way down. The process repeats itself several times, and each time she stops dragging, you think it has ended for good, but soon she starts all over again. You frantically call out to her and ask her why she is doing this. You wonder what you have done to earn this perpetual torture. But she only looks back at your with a blank, almost quizzical stare, and that is when you realize that she is unaware of the pain she is causing. You feel the hopelessness pass over you. You squirm to free yourself from the chair, but it's no use. This is your life now, listening to this terribly unpleasant sound with no way to stop it. Sometimes she leaves, but she always comes back to repeat the scene, oblivious to the torture she creates.