Why yes, they are left over from Halloween (for which we got exactly one group of kids for a total of four Trick or Treaters. FOUR KIDS!).
I took the rest of the candy into the office (Butterfingers, York Peppermint Patties, Kit Kat bars, Twizzlers, and I forget the rest) but we kept the Milk Duds. Wikipedia and other sources say they're called Milk Duds because of all the milk in the candy and because the original idea of having a perfectly round piece of candy failed. I sort of wondered about that.
They are small candies and since they're caramel, they aren't something you can eat quickly and best of all they are relatively cheap in terms of calories. So all you Leawood kids who didn't come to our house for Halloween, Kent and I are thankful you skipped us.