[ragebol]

And add googly eyes, makes many things better.

[robotfelix]

These two suggestions strike remarkably close to a fun university project I did, which featured chewing motions and Kinect-powered eye-contact :)

ROBERt (Recycling-Of-Bottles Encouragement Robot) https://www.youtube.com/watch?v=j02o4AaIu9w

Turns out a lot of humans will stick their arm inside just to see what happens!