All this also reminds me of how alien it can feel to be interested in a particular subset of a culture (kwhich only get more and more specific, for example: Geek Culture > Roleplaying Games > Tabletop Roleplay > Online Roleplay > MUing). If you're two steps further in than the person you're talking with, it can be a completely incongruous conversation. Applying MU concepts with my friends who only ever got as "deep" down the proverbial Rabbit Hole as Tabletop Roleplay can be an exercise in misunderstandings; long, drawn out explanations; and awkward, anticlimactic ends to conversations because... you're just not on the same page. You're not even on the same book, even if it's maybe the same series.
Super great analogy, mine. Yup.