I enjoyed this article a lot, and find the stats behind YC companies success to be fascinating. Besides the obvious Dropbox AirBnB examples, does anyone know of

I enjoyed this article a lot, and find the stats behind YC companies success to be fascinating. Besides the obvious Dropbox AirBnB examples, does anyone know of other similar stories of ideas that people saw as bad that turned out to be successful? Doesn't have to be at that scale but I enjoy reading about these.