Park Rapids, Minn., granny Nancy Leeseberg would have sworn the voice on the other end of the phone was her grandson. But in the end, she didn't fall for his story about a trip to Guatemala. The Fargo Forum has the story of how she avoided being a victim of the common "grandparent scam."
In short, the scammer calls an elderly resident and claims to be a grandchild, typically one in trouble and in urgent need of money. Here's more about how the scam works, and how it has gotten more sophisticated in recent years.
Met Life recently did a study on protecting seniors from financial abuse, perhaps the first large-scale analysis of the issue.