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When I was about 10 my sister, her best friend, and my younger brother had a séance in the backyard. We had a candle and something that belonged to my sister's friend's grandmother. We had no idea what we were doing but we spoke spooky words and asked for some sign that her grandmother could hear us. It was just about dusk and as we looked to the sky I saw a black film/fog/cloudy shape float over us. Some of the others said they saw it too but I know I saw it. It was creepy for a 10 year old.