In the "way beyond spooky" category we have this story of a family who recently made a grisly discovery while remodeling their house:

The family of a Georgia fifth-grader found bones of a child under the floor of their home and the child believes the bones belong to her imaginary friend.

Stephanie Ogden said a friendly black girl in a white dress began visiting her room about five years ago.

"She told me that somebody put her in the floor," Ogden said. "She said he had a mask on, and that he chopped her up. She didn't know who the person was, because he had a mask on."

Yeah, I know. Probably lots of after-the-fact "memory" and stuff like that. Doesn't mean it's not creepy to think about. *shudder*