Well, since I recently got word of this thread, I might as well contribute to it.
http://www.youtube.com/watch?v=xkgGcmSSbf4 -Here's the Regular ending (which was intentionally reversed to begin with)
http://www.youtube.com/watch?v=7BVV7e4uOQw - And the Reversed Version, which I managed to fix, myself.
I hope this makes it to the GoNintendo Blogs. They were the second and third uploads I ever do on Youtube, so many years ago. Explanation is like this: In Time Out Luigi, an episode of the Super Mario Bros. Super Show, Luigi wore a watch of strange and mysterious origin (Angelica, seller of all things strange and mysterious, played by Nedra Volz), which made him do all things backwards - Walking, talking, eating, and even dressing backwards! And in honor of that plot point, the ending was reversed. And thanks to running the video in reverse, the message is heard, but part of it was spoken as backwards as Luigi was. "Til Next Time, Everyone, MARIO THE DO!"