Classic Sesame Street - "Fat Cat Sat"

I love this sketch from the early 70s. Simple "limbo" set. The humor is in the wacky lyrics, timing, choreography, dynamics of the music, and the contrasts and reactions between the characters. Lovely little rhythm guitar going on in the background (making the tempo feel faster than it really is). Great use of the screen space -- Jim Henson came up with the idea of using wide-angle lenses in video puppetry to give great depth of field, so the main singer puppet isn't moving back all that far, but it looks like he is.

Or for a hoot, try this faster version.