http://www.consumeraffairs.com/news04/2006/03/worst_hack.html
It's a mystery that's better suited for a schlocky Hollywood thriller starring Harrison Ford, but it's all too real -- the stealthy cancellation of thousands of debit cards from various banks, due to a data breach involving a still-unidentified "third party retailer."
Avivah Litan, security analyst for the Gartner research firm, has called the data breach the "worst hack ever," saying it represented a new and dangerous frontier for identity fraud: the mass theft of personal identification numbers (PINs) used to authorize debit card transactions.