Some of the best ideas are born by pure chance.Entrepreneur and co-founder of Netflix Marc Randolph admittedly stumbled upon the thought of movie rentals by mail after dozens of strange ideas (including personalized shampoo) failed to spark enough interest.In an unlikely way, his career in the mail-order department of a sheet music company (more than a decade earlier) shaped his experience in a brand new setting. Shifting to the present, Netflix has now become a textbook example of how a slight change in bu ...