The writing prompt is to write the dialogue between Edward and the face. In your piece the face does not necessarily have to be saying 'evil' things. It might function as a conscience or they could have two very different personalities....and what would ensue.
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The
curious case of Edward Mordake is very poignant and sad.
"He was a man
that lived in the 19th century and was born with an odd deformity. He had an
extra face on the back of his head which was able to laugh or cry, although
there isn’t any proof that it actually expressed these emotions. He committed
suicide when he was 23 and lived totally isolated for most part of his life." (from website, see link below).
Edward
Mordake - Was he truly real?
"Apparently [the face] smiled when he cried and the eyes followed the movements
of people around him.
"Another
interesting but highly implausible thing was the fact that the face seemed to
be speaking, but nothing could be heard. However, Edward could hear what it was
saying and he begged the doctors to remove the face from his head because it
talked to him forever about 'things from hell.' But the surgeons refused to remove it because it was too
risky.
"[Edward] used poison to commit suicide and asked in his suicide letter that the face
would be removed before burial 'lest it continues its dreadful whisperings in
my grave.'"