AN EE WAS REMOVING A VEHICLE U JOINT FROM A DRIVER SHAFT BY STRIKING IT WITH A HAMMER. A SMALL FRAGMENT BROKE FREE FROMT HE U JOINT AND STRUCK AN EE STANDING APPROX. FIVE FEET AWAY INT HE LEFT FOREARM. THE EMBEDDED SLIVER WAS REMOVED BY THECO DR. EE RETURNED TO WORK AND REGULAR STATIS.