Nerd of the Rings

My sister and her boyfriend called over on Saturday, and we watched bits of FotR. She's borrowed my LotR boxed set to get the "real" story. During the course of watching, both her and the boyfriend asked me various questions about LotR, FotR, and so forth. And I was able to answer pretty much all of 'em. Correctly. With Proper Names, occasionally.

I hadn't realised I was that much of a Tolkien geek.

Actually, I'm re-reading The Hobbit. I notice when Bilbo meets Gollum, he reveals himself to be Mr. Bilbo Baggins, but never mentions the Shire. So how come Gollum's giveaway in Barad-Dûr is "Baggins! Shire!"?