I'm playing Guitar Hero with a friend, and they show me a custom they have of the McRoll. They had no idea what it originated from, so I told them. We went back to playing.
A couple weeks later, I show him the back half of EoSD extra (to show him exactly what it originated from), and he thought the worst one was Flandre's final nonspell because it was "active dodging, not just you move when you need to". I showed him Remilia on lunatic (because he asked who the final boss was, if not Flandre), then a few of the more visually impressive spells, before showing him something more managable (PCB stage 1 normal). He seems interested in it, as he clicked on an IN extra video (and thought Fujiyama Volcano was impossible :V).
Then his roommate walks in and says "Oh, is that Touhou? Isn't that an anime?"
Naturally I said it wasn't. (and was surprisingly annoyed be it...)