Longtime readers will remember my earlier posting of Mister Rogers testifying before Congress. Here he is doing something a bit less, um, dignified, courtesy of SCTV.
I actually saw this when I was a kid. My sisters & I watched my dad changing the channels, and he landed on PBS just as they were showing this. We kids absolutely lost it, especially at the moment that occurs here at 2:12. A quarter century or so's gone by, and it's still a riot to me.