One of my best was a combined RL/LOTRO moment.
My wife had a few friends over. I was playing LOTRO in my study. Her friend X wandered in to say hi as I was doing something or other in Rivendell. One of the elves said "Mae Govannen."
X says "That sounds like Sindarin."
She asks "What are you doing?" as she walks behind me to see the screen. "That's Rivendell! What are you playing?"
Turns out X is a major Tolkien maven, as in: reads and writes Sindarin as well as speaks a little. Spent the next hour taking her on a tour of all the level 1-75 areas with my 85 Hunter. Let her drive in the Shire since she knew the map from reading the books a gazillion times. Amazed her with Moria and Lothlorien. Creeped her out in Mirkwood.
It was just plain fun for both of us.
We're having a party in a couple weeks and she's asked if she can come early and see more. I'm planning to save an 85 and show her the Epic quest line from Entwade into Edoras followed by a tour of Isengard and Fangorn.
She has no interest in playing an online game, but is thrilled to be able to see and run around in Middle Earth.
Cener, Ingo, Rilibald, Hesred, Halras, Loringo
Arkenstone (ex-Elendilmir) - The Osgiliath Guard