The riff: Spoken by Tom while the serial’s opening narration is displayed on screen. The reference to Clark Mountain is genuine, but the rest is obscured by the theater seats, so he adds the bit about “Zagnut Valley.”
The explanation: The reference to Clark Mountain made Tom think of the D.L. Clark Company, once one of America’s great makers of candy bars. As previously mentioned here many months back, they were the makers of the Clark Bar, a chocolate and peanut butter candy bar. They also made Zagnut, a similar candy bar that instead had the chocolate replaced with a coconut exterior. Zagnut is still manufactured today by Hershey.
Novelty factor: I’ve never had a Zagnut bar before (I don’t like coconut), but I did recognize the name. Check out this great commercial that pokes fun at the strange Zagnut name.