Sad but true this one.
One of my customers worked in a charity shop had a call from the police to say that they had caught a thief that had stolen her bank card and could she check her handbag to see it was stolen. She did check and they were right it was missing. She was obviously upset by this news and the police asked her to confirm her pin number for security reasons. She obliged with 2416 or whatever it was. The police thanked her and advised that they were on the way to meet her to give her card back.
Of course it turns out that it wasn't the police but the thieving wotsit that had nicked her card who then went on to use her pin number to nick her money from her account.
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