Jingle Bells is one of the most recognizable Christmas songs ever written… except it wasn’t written for Christmas at all. In this week’s Mistake of the Week, we unpack one of America’s most enduring cultural misconceptions: the belief that Jingle Bells has anything to do with Christmas. Originally titled One Horse Open Sleigh, the song debuted at a Thanksgiving church service in the 1850s and was inspired not by Santa or reindeer, but by noisy, fast sleigh races in Medford, Massachusetts. No Christmas trees. No North Pole. Just winter racing, youthful chaos, and a catchy melody. Over the decades, repetition turned assumption into “truth,” and a Thanksgiving song quietly shifted into a holiday anthem. It’s a perfect example of how knowledge mistakes spread — harmless, familiar, and rarely examined. In this 3–4 minute episode, Mark explains: Why Jingle Bells was never meant to be a Christmas song How repetition and cultural habit transformed it anyway What this teaches us about assumptions, organizational habits, and the stories we never question Why small knowledge mistakes can persist for generations If you care about learning, improvement, and understanding how mistaken beliefs take root, this episode offers a fun seasonal reminder: even our most cherished “facts” deserve a second look.