Have you heard about Edward Mordrake? Probably not. He is a man described as having two faces! He was born with a rare medical condition where he had an extra face at the back of his head; a form of craniopagus parasiticus (a parasitic twin head with an undeveloped body),. This second face, they said, was not as large as the main face, nor did anyone ever hear it speak. But it was seen depicting some devilish characters like: smiling and sneering when ever Edward was crying. It was said to have tormented Edward so much that he begged the doctors to get rid of this evil by all means, even if he died in the process. According to him, the "evil face" always whispers scary things to him whenever he was alone, especially at night, telling him things that could only come from hell. At the age of 23, Edward committed suicide.
What do you think? 
His skull: 