Check out the youtube videos of the B9 Robot from Lost in Space!
These are full size, full function, all-out replicas of the TV show robot.
This is the best toy I have ever seen in my life!
They have all the lights, voice, mechanical movements, everything!
I think they cost $25,000 each, IIRC.
http://www.youtube.com/watch?v=w3J9MVPc_IY
http://www.youtube.com/watch?v=5ctRpMwaz_8