The moment that made my girlfriend squeal with glee, to a degree that my eardrums have yet to recover from, was when she walked into Bag End and looked at the wall next to the door, to see the pegs. The pegs from which the dwarves hung their cloaks in the first chapter of The Hobbit.

I was also goofily excited when I encountered Gaffer Gamgee, not that he's particularly well-hidden.