One of my best friends, whose name I am not going to use, used to live in a haunted house. He grew up in a spiritual family, very religious. One year ago, they moved out of a house which is about 4 miles from where I live now, and about 5 from where he lives.
They lived in a house in a small neighborhood. The house had an entity in it called an Imp. Now, according to what they have told me, it is not quite a demon, but very close. They are similar to a Poltergheist, and somewhat similar to a demon. Almost like a combination of the two. They said this entity could move very fast, was shaped like a large black ball, and could go invisible when it chose to willingly.
One of the very first nights they moved into that house, my friend's younger brother and his mother saw it with a clear sight. My friend described it to me as more of something you would see in the corner of your eye, not usually a close look. He never actually saw it up close like they did. They bought a dog to live in th e house with them because they did not feel very comfortable. Sometimes in the middle of the night, the dog would wake up growling, and following something while it would sniff at the ground. This was when it was invisible. (Note: Dogs and Cats can see spirits when humans can not, meaning while they are invisible). My friend, every night, would put a tall glass of water next to his bed to drink if he got thirsty during the night. Almost every morning, he would wake to find the glass had less than an inch of water in it.
One night, his older sister, whose name I will also not mention, woke up while sleeping in her room. She would always lock her doors and windows in that house. She thought someone was at the door. I forgot to mention, they had a black cat at the time of living in this house. She opened the door and saw what she thought was their black cat. She let it in and locked her doors and windows again. The next morning, she woke up and realized that the cat was not in the room, or anywhere in sight. She asked the family if they took the cat out of her room, and they all said they had not been in her room. They believe the Imp took form of a black cat to get inside of her room.
My friend tells me that this house did not only have this Imp in it, but other lost spirits. There would be random wandering spirits in the house of random people they did not know. They would be in their rooms sometimes, and random people would be standing there with no expressions on their faces. They finally decided to move out of that house, and into the house they live in now, which is a 10-15 minute walk from mine. They were all sitting on their couch the night before the move, and my friend says that in the first time, he had a very close encounter with this entity. All of a sudden, something with a very deep, evil voice whispered in his ear "Hey, you..."
They did move, but they found out from their current neighbors that the neighborhood had quite a few houses with similar entities lurking inside of them. I asked his mother, "What do you think it was? Do you think it could have been from another planet?" (I am very interested in aliens and UFOs, so I of course thought of this). She responded "I don't know, it's possible there's life on other planets".
I can not say I know exactly what this entity was, why it was there, or where it came from, but I do think it is a possibility that Satan sent it. From somewhere else in the universe, I don't know. Perhaps the neighborhood had a history of demonic rituals. Ever since, in their new house, they have had it blessed, and the Virgin Mary, mother of Christ, has helped them out in an amazing way.