To break up the awkward silence at the start of a recent Overcoming Bias meetup, I asked everyone present to tell their rationalist origin story - a key event or fact that played a role in their first beginning to aspire to rationality. This worked surprisingly well (and I would recommend it for future meetups).
I think I've already told enough of my own origin story on Overcoming Bias: how I was digging in my parents' yard as a kid and found a tarnished silver amulet inscribed with Bayes's Theorem, and how I wore it to bed that night and dreamed of a woman in white, holding an ancient leather-bound book called Judgment Under Uncertainty: Heuristics and Biases (eds. D. Kahneman, P. Slovic, and A. Tversky, 1982)... but there's no need to go into that again.
So, seriously... how did you originally go down that road?
Added: For some odd reason, many of the commenters here seem to have had a single experience in common - namely, at some point, encountering Overcoming Bias... But I'm especially interested in what it takes to get the transition started - crossing the first divide. This would be very valuable knowledge if it can be generalized. If that did happen at OB, please try to specify what was the crucial "Aha!" insight (down to the specific post if possible).
When I was a little kid we would take car trips to visit my grandparents, and my father would borrow books on tape from the library. He borrowed Asimov's "I, Robot", which if you haven't read it is basically "House, M.D." except that instead of people you have robots and instead of Dr. House you have a pair of underpaid robot repairmen. It didn't introduce any concepts of rationality directly, but in the book the heroes won by figuring things out, rather than by being strong or passionate or morally correct. It made figuring things out cool, and it turns out that if you want to figure things out, you use rationality.