DRIVER CAME TO PICK ME UP. DRIVER STOPPED, HE THOUGHT HE PUSHED PARK BUTTON. STARTED TO GET OUT OF CAR. GOT LEFT FOOT ON GROUND, SWUNG RIGHT FOOT OUT AND CAR STARTED ROLLING BACKWARDS. CAR DOOR KNOCKED HIM DOWN, CATCHING LEFT FOOT BETWEEN DOOR AND FRAME. CAR STARTED DRAGGING DRIVER DOWN STREET IN REVERSE. I HAD TO RUN AROUND DOOR, PUT CAR IN PARK. DRIVER DRAGGED BETWEEN 5-10 FEET(EST). DRIVER ENDED UP WITH FRACTURED LEFT ANKLE, 3 BROKEN BONES IN LEFT FOOT, ABRASIONS ON RIGHT SHOULDER AND LEFT ELBOW, HEMATOMA ON RIGHT LEG. CAR WAS ON A VILLAGE PAVED STREET, IN REVERSE INSTEAD OF PARK. IT WAS DARK , THE DRIVER THOUGHT HE PUSHED THE PARK BUTTON BUT EVIDENTLY PUT THE CAR IN REVERSE BY MISTAKE. CAR STARTED ROLLING WHEN HE TOOK RIGHT FOOT OFF BRAKE.