Does anyone remember this? I can’t find anything about it via Google; maybe someone else can help.
David Letterman did, IIRC, a New Year’s Eve special one year. This would have been New Year’s at the end of probably 1988, but it could have been a year or two in either direction. I don’t know if it was his regular show, or some kind of special, but I’m pretty sure it was done with a live audience in a big auditorium.
The only detail I remember clearly is that, at the end of the show, a white horse came out on stage, and Dave got on it. With the cameras following, he rode the horse off the stage, out of the theater, into the parking lot, and off into the night, out of sight. It was a really cool ending to the show.
But I’m Googling and I can’t find anything; does anyone remember this, or know anything about it? Did I just imagine the whole thing?
Shroud’s answer sounds about right, it was an anniversary special, thought they also re-ran it at the end of his very last show for NBC (spring of '93). Dave riding off into the sunset (for NBC anyway)…