For any poor ignorant folks who have never heard "Who's On First."

I have heard it a hundred times, and it still makes me laugh. Absolutely the best, most clever comedy routine ever done.

LINK

The routine was mostly developed by the comedians themselves, but it was a revision of an older routine called "Who's the Boss," a link for which which can be found in this blog LINK. This example is from the old radio show, It Pays To Be Ignorant.