THROTTLE WAS HANGING ON TRUCK. HE CLIMBED UP ON TRUCK TO SEE WHAT WAS CAUSING THIS. IT WAS STILL DARK AND HE DID NOT SEE ICE THAT HAD FORMED ON TRUCK. HE STEPPED ON A SHEET OF ICE CAUSING HIS FEET TO COME OUT FROM UNDER HIM AND HE FELL FROM THE CAT TRUCK. HE CUT THE BACK OF HIS HEAD (STITCHES REQUIRED) AND SCRAPED LEFT WRIST. PAIN IN LOWER BACK.