People are being possessed by demons every day, without knowing it. This happens more often to those with an interest in the occult, and those who drink alcohol. The only way to know you have been possessed is missing time. If you suddenly notice that it's later than you thought it was, you may have been the play-toy of a demonic entity, which rode you like a pony. They can make you do anything -- commit arson, rape, murder. Most of the serial killers have been possessed by demons. Drinking alcohol lowers your ability to resist their control over you.