The Book
You decide to leave and worry about the book later. You go downstairs and gather your things, then you tell your dad that you´re ready to leave. He turns off all the lights then opens the door. You find that, for some reason, you can't go through the door. It is though there is an invisible wall or barrier. You explain to your dad, and he asks if there was a book in your room, and what you did with it.