1. SUMMER, 2011, @ 35,000 MI CAR WAS PARKED @ BOTTOM OF MY STEEP DRIVEWAY, A FEW FEET BACK FROM A RR TIE PINNED TO GROUND BY 3 REBAR IN FRONT OF CAR TO BLOCK WHEELS. I INTENDED TO BACK UP DRIVEWAY, WITH GEAR IN REVERSE, BUT WHEN I RELEASED BRAKE, CAR CATAPULTED FORWARD WITH SUCH FORCE THAT IT BENT REBAR @ RIGHT ANGLES, LIFTED RR TIE UP IN THE AIR & OVER ON ONE EDGE, & THE CAR JUMPED UP ON TOP OF IT, WHERE IT STUCK. I SAW THAT THE GEAR SHIFT HAD SLIPPED OUT OF (REVERSE) GEAR INTO NEUTRAL. CALLED AAA ROAD SERVICE TO LIFT CAR OFF. NO OTHER DAMAGE. 2. MAY 21, 2015, @ 50,000 MI. BACKING UP MY 82' LONG STEEP DRIVEWAY, I WAS TOO CLOSE TO TREE ON RIGHT 3/4 OF THE WAY UP, SO I TURNED THE WHEELS SLIGHTLY LEFT TO BACK ARC AWAY FROM IT, BUT STILL TOO CLOSE. I INTENDED TO RETURN TO BOTTOM OF DRIVEWAY TO START OVER & ADJUST ANGLE OF CAR AS DONE 100S OF TIMES. WITH BRAKE STILL DEPRESSED, I SHIFTED GEAR FROM REVERSE TO DRIVE. AS I LIFTED BRAKE, BEFORE MY FOOT COULD MOVE TOWARDS THE ACCELERATOR, SUDDENLY CAR SHOT OFF LIKE A ROCKET DOWN STEEP SLOPE TO LEFT, THROUGH 2 WOOD FENCES, OVER DRIVEWAY NEXT DOOR, INTO SWIMMING POOL FULL OF WATER - WHICH SLOWED CAR TO A STOP & SANK WITH ME IN IT. GEAR SHIFT HAD SLIPPED OUT OF (DRIVE) GEAR INTO NEUTRAL. CALLED 911. CAR TOTALLED. MIRACULOUSLY NO OTHER DAMAGE TO ANYONE ASIDE FROM MY TRAUMATIC EXPERIENCE. NOTE: GEAR SHIFT WAS THE TINY KNOB ON DASHBOARD TYPE, TO MOVE WITH FINGER TIPS IN VERY SMALL RADIUS. I NEVER HAD THE PROBLEM ON THAT STEEP DRIVE