Biting my fingertips/Peeling and eating Scabs :L Since middle school I've always been biting and chewing on the ends of my fingers. At one point it got so bad that both my hands were constantly bleeding... I remember one particularly painful woodwork lesson, where I got sawdust in the cracks and sores... That was not very fun. I'm not too bad for it now, but I still bite them now and then.