[youtube]HItxDvCsV7k[/youtube]
The children I take care of's parent's have the "Sesame Street: Old School" DVDs sets. The other day, the three of us were watching, and this skit came on. I vaguely remembered it. We were all laughing and having a great time, but when the teeth started tearing the desk apart, Sadie, who is one-year old, started hysterically crying and screaming, and I couldn't get her to stop for 20 minutes. When I looked this up on youtube, the tag said that apparently a lot of children were scared by the teeth.
Also, it sounds like Don Knotts is doing the voice.