MY CAR WAS PARKED IN MY GARAGE (BACKED IN). I ENTERED THE VEHICLE AND THEN PLACED THE KEY IN THE IGNITION AND STARTED IT. MY LEFT HAND WAS ON THE TOP OF THE STEERING WHEEL, MY RIGHT ON THE GEAR SELECTOR, AND MY LEFT FOOT ON THE BRAKE. AS I PULLED THE GEAR SELECTOR FROM 'PARK', THE STEERING WHEEL AND DRIVERS SIDE CURTAIN AIRBAGS DEPLOYED (VERY LOUD EXPLOSION!). THE CAR WAS STATIONARY AND DID NOT MOVE - I RETURNED THE GEAR SELECTOR TO PARK, TURNED OFF THE CAR AND EXITED IT THROUGH THE DRIVERS DOOR. I WAS NOT INJURED, EXCEPT FOR THE RINGING IN MY EARS THAT DISSIPATED OVER THE NEXT FEW DAYS.