For millions of kids in the West, the story is as mysterious as it is profitable: Once your baby teeth begin falling out, hide them beneath your pillow. Sometime in the night, the Tooth Fairy will retrieve the tooth, leaving you some cash -- perhaps spare change, perhaps as much as twenty dollars -- to thank you for your gift. So where does this idea come from? Join the guys as they explore the strange, surprisingly recent origin of the Tooth Fairy. (And parents, if you're listening with your kids, be warned: This episode does include spoilers.)