WHILE AT GROCERY STORE, ENGAGED REAR POWER LIFT GATE ON KEY FOB. LIFT GATE OPENED AND STARTED LOADING GROCERIES INTO REAR OF VEHICLE. WITHOUT WARNING THE LIFT GATE CAME DOWN HITTING ME IN THE HEAD. THERE WAS SO MUCH PRESSURE THAT IT KNOCKED TO MY KNEES. THE HEAD STRIKE CAUSED A CONTUSION AND RAISED LUMP ON MY HEAD AND MINOR CONCLUSIVE SYMPTOMS. *TR