Hall of Infinite Doors

You throw your body into the wall like a limp noodle being thrown against a wall to see if it is finished cooking. You do this again and again until your clothes are torn and there is a large bloody imprint on the wall. You continue slamming as bones snap and break for you feel no pain. Eventually you lose conciousness and never regain it...

Moral of the story: Just because you can't feel it doesn't mean you aren't hurting yourself.