My Body, Yet Not Mine (an attempt at a two sentence horror story)

When I opened my eyes I saw that a knife was poised over my throat, held in a hand; my Hand, but I had utterly no control over it, since it floated unattached in the air. As I opened my mouth to scream, I realized that my Voice was not with me, but in the corner of the room and I heard it say, "Farewell!" as I watched it walk out the door.