The Computer Monster.

There's also this Sesame Street video, where Maria explains to Cookie Monster how computers work. I must say, it took, because I'm sure he was my sysadmin at one point...

It's actually from 1967. The video is from a computer training session that Jim Henson put together for IBM. The monster at the time was called "Arnold the Munching Monster". After his first appearance, Arnold sat in Henson's closet for 2 years, until it made a brief appearance in 2 Munchos potato crisp commercials.

When Arnold appeared in Sesame Street in 1969/1970 (its first season), he was unnamed and still rather scary. He quickly was fashioned as the Cookie Monster and took on the toothless "friendly monster" appearance we all know and love today.

I submitted the video to digg (link here) for anyone that likes it. I thought it was hilarious.

Thanks, Lala! I had wondered how old this clip was, and from the link you posted, I would guess late 60s.

this is so old! i read on a few websites that this is what cookie monster looked like back when, green w/ teeth and more scary lookin, here's a link of "Cookie Monster through the years: http://muppet.wikia.com/wiki/Cookie_Monster_Through_the_Years

So cookie monster used to have teeth? Thats a new one to me.