The Einstein robot.
The walking shots are what Einstein would look like sneaking up behind old people to eat their medicine for fuel.
And here's an excellent article (WARNING: creepy photo) about recent studies into the phenomenon of The Uncanny Valley -- how and why humanoid robots and CG movie characters creep us out. I actually think they should rename it The Creepy Zemeckis. After Beowulf and Polar Express, he still had the balls to make A Christmas Carol with all of its creepy simulated Dickensian humanoids. I don't understand who gave him the money to do this again.