A recent grad looking for a job with an investment bank picked 64 banks and sent each of them a letter introducing himself. To a half of them he also added that next week Ford stock will be up and to other half he said it would be down.

Next week, one half of the banks were off the list, because he was wrong. He split remaining banks in half again, sent another letter making his up/down prediction and repeated again for 4 more weeks. After 6 week there was just one bank on the list, but it was the one that saw him make an accurate prediction 6 times in a row. And so he sent them the job application.