When I was about 10 or 11, my sister and I had been using a Ouija board before we went to bed. My bedroom was downstairs in a semi-basement (home was built on a slope), and my sister's was upstairs just above me. Shortly after I turned out the light, I heard my closet door slam inexplicably. It was a sliding door, but the bottom rail was missing, so they could swing outward. It was like something pulled one door away from the other and let it go. The room was very dark, but when I looked towards the wall, I thought I saw a horrible face hovering above the closet. I covered my head with the blanket and my sister suddenly came down for some reason, opened the door and turned on the light. We never found out what it was, but it scared me so badly that I never used the Ouija board again.