Admittedly it's been a while since I've last seen this lamp in action (Toy Story 3 might've been it). But who can deny that the sound effects, the rhythm, and the actions of this little lamp hasn't been burned into our memory?
The lamp, or Luxo Jr., is cleverly recreated by Flickr user yu chris out of a combination of LEGO System and Technic parts. I could be wrong, but it really does look functional and bendy. You stomp that letter I till it's gone!