Edward Mordrake (sometimes written Edward Mordake) is claimed to be a 19th century heir to one of the peerages in England who had an extra face on the back of his head. According to the story, the extra face could neither eat nor speak, but it could laugh and cry. Edward begged doctors to have his 'devil twin' removed, because, supposedly, it whispered horrible things to him at night, but no doctor would attempt it. He committed suicide at the age of 23.
This scares the crap out of me! I have been reading forum about Edward and almost everyone agreed that he has really existed before.
Accordingly, the devil twin's eyes follow spectators eyes and movement. The face smiles whenever Edward cries. Believe it or not.