On HN? None. But I personally know people who did not care about programming until they encountered a language or teacher or project which really clicked. LPTHW seems to do that an awful lot, in fact.

I take that back, on HN, at least one, in this very thread it seems: http://news.ycombinator.com/item?id=3205485

There's also a degree of selection bias to account for here. Any ideas on how to get around that?