What is the creepiest thing your child has ever said to you?

I  babysat my niece with my two kids last night, while my sis was away at a big event with her husband, when Emily said something that sent chills down my spine. She didn't want to go to sleep and protested, but as I leaned to kiss her goodnight, all of a sudden she pointed to the corner of the room and asked why the other girl doesn't have to go to sleep. I turned around to where she was pointing and there was no one (obviously). Needless to say, I didn't sleep that night.