MY SUV WAS PARKED IN MY DRIVEWAY. I OPENED THE LIFTGATE AND SLIGHTLY LEANED IN TO LOOK FOR AN ITEM. THE PASSENGER SIDE STRUT THEN FORCIBLY EXPELLED, WHAT APPEARED TO BE, A WHITEISH GAS/LIQUID MIXTURE. THE LIFTGATE IMMEDIATELY CAME RIGHT DOWN, HITTING ME IN THE TOP OF THE HEAD VERY HARD.