Have you received in the past an email coming from Nigeria? Someone with a lot of money (often a prince), who needs a reliable person who can help to transfer the money temporarily to another bank account. Most likely (and hopefully) you laughed about the silly and illogic text and clicked ‘delete’. Maybe you wondered who does react to such email. If so, you can read it in “Think like a freak” written by Steven Levitt and Stephen Dubner.