Stolen from: http://blog.wfmu.org/freeform/2007/04/the_uncanny_val.html
See: http://en.wikipedia.org/wiki/Uncanny_Valley
“…as a robot is made more humanlike in its appearance and motion, the emotional response from a human being to the robot will become increasingly positive and empathic, until a point is reached beyond which the response quickly becomes strongly repulsive. However, as the appearance and motion continue to become less distinguishable from a human being’s, the emotional response becomes positive once more and approaches human-human empathy levels.”