I have many favorites in the CBSRMT canon.  But this episode is my favorite-favorite!  Kevin McCarthy does some of the best work of his career; his rendering is iconic and definitive in its own right.  The supporting players also step up to this level.  I wonder if Brown and the actors could tell that this piece was coming together in a special and superior way.
All that being said, I have a different favorite comedy episode . . . but even so, this one tops my list of all the shows.  