This bike safety video might scare and/or confuse you but that’s part of the fun. Thanks to @sburgay for the find!
1963 Bicycle Safety Film entitled “One Got Fat”. A group of monkey-masked kids decide to ride their bikes to the park for a picnic. Along the way, one by one, the kids are knocked out of the ride due to careless or unsafe riding. Narration by Edward Everett Horton of “Fractured Fairytales” (Old Rocky and Bullwinkle) fame.