Mervyn's department stores ran a number of advertisements featuring the voice of Kongar-ol Ondar and Richard Feynman.  They were kind enough to provide us with a copy; one of the ad spots is available here as a historical remnant - sorry it's so small, but that's the file we were given at the time.  This spot is titled "Yo-Yo" (Martin/Williams Ad Agency for Mervyn's California).

Here's the original comment we had on this page when it was first posted in the 1990s:
* Streaming video looks terrible on slow-speed connections -- so this video clip has been optimized for high-speed connections.  This makes for much higher image quality and smoother action.  If you have a slow connection, this means that the entire video will download to your computer before it plays.  Be patient -- it's worth it!  The file is 566K in size and can be saved to your computer so you can watch it over and over again.

The video was provided to us in RealVideo format, which is practically indecipherable in these days.  Times have changed since then!