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Satanists do this sort of thing. A being appears out of nowhere then gone when deed is done. Demons can inhabit animals such as dogs, and dare I say cats etc. then transform , shape shift into another form, such as human appearance. The stuff you see in movies and TV sometimes are reconstructions of what they have experienced. Many of us know that the movie and music industry is full of these types of folks.
Oh I see. I really have no idea what Satanists do, so I sure won’t challenge you. It would make sense that evil people would engage in such practices. I was thinking normal people....lol hoping there are lots left!