Oh, I wish I knew... because it's happened a number of times that people just ask me about bitcoin w/o me ever mentioning bitcoin to them. I've never brought up bitcoin with anyone w/o them expressing an interest first.

These are obviously all people that know me, but not necessarily each other. And they often end up becoming Bitcoiners themselves.

When I ask them why they think I would know anything about bitcoin, the usual response is something like: "I don't know. You just seem like the kind of guy that would know about bitcoin."