So-called Nigerian scams, where victims are ultimately tricked into sending money to the African country using some irreversible method like a wire transfer, are common. The Secret Service and other U.S. agencies have issued warnings on the scams, also known as "419" or "advance-fee" frauds. But the seductive flavor of this type of the scam — known to some as "sweetheart scams" — and the incredible patience shown by the scammer reveal just how far con artists will go to trick their marks. ...