When my sister was little, she had an imaginary friend called Jackie. One Sunday, my great aunt was over and my sister came in, announced to the room that Jackie fell down the stair and died, and left. My great auntie calmly looked up and said “how did she know about that?” Apparently, my great auntie had a little brother called Jack (her mother, who died a little before my sister was born, called him Jackie) and when he was 7, he fell down the stairs, banged his head and died.
When I was a little girl, I had imaginary friends that would leave once I had “learned a lesson,” and then I would get a new one. Apparently one time when my mom was giving me a bath, I looked up and and told her that one of my friends, a ghost made from dust named Earthly, would only leave when I learned what pain was.