[YouTube - Link]
Cookie Monster apparently began his life as a creepily toothed puppet in an IBM training video. Whether the technical information being conveyed is at all true, or simply for comic effect, I have no idea, but it's interesting to see the original incarnation of one of Sesame Street's (and Jim Henson's) most famous creations.
Via Presurfer
http://www.neatorama.com/2007/04/25/the-computer-monster/