Trapped in the side-door tunnel at the beginning of Chapter 13 of The Hobbit, “Not at Home,” Bilbo leads the party in the only direction they can go: down. At the bottom they find no sign of Smaug, and the Dwarves rejoice at the recovery of their lost treasure. Only Mr. Baggins realizes that the celebration is premature and wonders where the dragon is. We examine the Arkenstone and the many meanings of a deceptively complex chapter title, and if you thought cram was hard to eat, wait until you hear how hard it is to figure out its etymology.