My aunt often told us the story about how when she was a little girl, she was terrified of having to go the bathroom at night. There were toilet ghosts, you see, that grabbed at her or which appeared in the mirror or in the corners of the room. They stared and laughed at her and ran the length of the ceiling, disappearing behind the toilet and into the walls.
Most nights, this would happen.
Eventually, she learned to hold it until morning. She advised us to do the same, because who knows?
Lesson: Anyone can learn, given the right incentives.
Also: anything can happen if you decide to go wandering at night, even the ridiculous impossible. Even in your own home. Especially in your own house. Ghosts can do more than just beckon.