^ That happened on an episode of The Mentalist. To trick someone into thinking he could get pick any horse race with 100% accuracy, he bought every possible outcome. He did it to solve a crime, but it cost him a lot of money in the process.
There was a similar story in a Mathnet episode except the scam artist was smarter----he didn't actually buy tickets, he just sent different predictions to a bunch of different people, and followed through with more predictions for those people to whom he'd sent winning race predictions. Eventually one person had gotten every winning prediction and trusted him completely to handle their money....