I'm sure I've mentioned it before, but one of my favorite book series as a kid was John D. Fitzgerald's The Great Brain books.
I read all the books a billion times, but as a kid I chanced upon an old paperback version that read something like "Soon to be a major motion picture starring Jimmy Osmond!"
In all the years since then, I've still never come across that movie. I'm sure somehow, someday, I'll track it down, but for now I'll have to settle for a clip on YouTube of Jimmy performing the theme to the movie.
This is the first time I've heard the song, and wouldn't you know it, the damn thing is stuck in my head already.
I'd love to see even a TV movie of these books made in the future.