One Got Fat is out and out one of the freakiest PSAs ever made. It's only $0.99 to download and it's definitely worth it. If you're familiar with Mystery Science Theater 3000, it's VO'd by some of the MST cast. A bunch of monkeys(?) go bike riding to disaster, narrated by Fractured Fairy Tales voiceover talent Edward Everett Horton.
The midcentury time was apparently a scary time to be a kid. madame_ugly, I think you'll get a big kick out of the "monkeys".
(Someone wrote a Wikipedia page about this, but it is so chock-full of spoilers that I'd say don't read it until after you've seen this short film.)