Trevor Blackwell has a good article (https://web.archive.org/web/20070602193754/http://tlb.org/fo...) on founder stories.
"Early on, when a reporter asked me how I came up with the idea for Anybots, I answered honestly that I made a list of all the ideas I thought might really change the world in the next 20 years, and picked the one I thought I could contribute most to. His eyes glazed over. It's unprintable."
A lot of people seem to take the "romantic origin story" as a template to follow, and waste a lot of time as a result.