Ka-reepy! But I kinda love it.
Some Stanford brainiacs have taken expression-transfer technology to a new level, enabling one person to puppet the face of another, all in real time; see project site & blurb below.
We present a method for the real-time transfer of facial expressions from an actor in a source video to an actor in a target video, thus enabling the ad-hoc control of the facial expressions of the target actor. The novelty of our approach lies in the transfer and photo-realistic re-rendering of facial deformations and detail into the target video in a way that the newly-synthesized expressions are virtually indistinguishable from a real video.