One time I was at the supermarket waiting to check out. In front of me is an elderly woman, and in front of her is an Asian family with a baby girl and a young boy that is about 4yo. While the father of the family is paying the little boy turns around and looks up at the elderly woman. Then without any emotion at all the boy says "I want to kill you" to the old lady. The boy then stands there staring at the lady until his father comes back and grabs him after realizing that he left his son behind. The old woman, in shock, turns around to see if I heard it too, and all I can do is nod.
TLDR: creepy/ possessed child at the supermarket