This Japanese video really creeped me out when I first watched it. The video shows some sort of apparition appearing in the mirror as the little girl turns her head.
The thing is, I wouldn't call it a ghost, considering that is still the living girl's reflection in the mirror. Maybe it is some sort of Demonic Doppelganger? I still wonder, if it is not a fake, how was that done, why was it done, and was a ghost responsible?