OMG.
First off... let me review the actual ad, then I have more to say.
The ad itself is a treasure! Brought back tons of memories. I appreciate the uploader for posting this here.
Now, here's the the link to the ad on youtube. My only reason for asking anyone to go here is to read the comments. I thought until today, that I was the only kid on the planet who got freaked out by this ad. I'm not. And the very same feeling I got as a kid, and I still get hearing it now is shared by others!
http://www.youtube.com/watch?v=MpgdyPH_P58