Here's one from an interview with Chris Sacca (http://www.youtube.com/watch?v=Q6NpHbMFaQ8):

In the late 1990s, Chris Sacca used his student loan to start a company within the lawsuit industry - not to pay tuition. But he realized the idea was bad, he didn't have the skills needed, and he didn't have any investors. So before he ran out of money, he began day-trading stocks with the remaining money. This was during the buildup of the tech bubble so he made a huge profit from the trading. When the bubble exploded, his wealth decreased from 12 million to -2.8 million. His surroundings had convinced him that he was a stock market genius - so he thought he knew something. When the stock market crashed, he thought he was just unlucky. He was now 25 years old, no network, and had to find a way to make 2.8 million.