Many years ago, a woman sitting on a train had an idea pop into her head...

Many years ago, single mom Jo Rowling was sitting on a stopped train and an idea for a story popped into her head.  She didn't have anything to write with.  So she just sat that and thought about it... for four hours.  In the video above, J.K. Rowling gives us a look at the first five years of work on the story of Harry Potter.  That idea made her a billionaire.  You never know what a random idea will ultimately turn into.  Here's a great documentary on how the Harry Potter phenomena came about.