Here's a credit card scam making the rounds:

The scam works like this: Person calling says, “this is <name>, and I’m calling from the Security and Fraud Department at VISA; My Badge number is 12460. Your card has been flagged for an unusual purchase pattern, and I’m calling to verify. This would be on your VISA card which was issued by <name> bank. Did you purchase an Anti-Telemarketing Device for $49799 from a marketing company based in Arizona?” When you say “No”, the caller continues with, “Then we will be issuing a credit to your account. This is a company we have been watching and the charges range from $297 to $497, just under the $500 purchase pattern that flags most cards. Before your next statement, the credit will be sent to (gives you your address), is that correct?” You say “yes”. The caller continues.. “I will be starting a Fraud investigation. If you have any questions, you should call the 1-800 number listed on the back of your card (1-800-VISA) and ask for Security. You will need to refer to this Control #.” The caller then gives you a 6 digit number. “Do you need me to read it again?” Here’s the IMPORTANT part on how the scam works. The caller then says he "needs to verify you are in possession of your card”. He’ll ask you to “turn your card over and look for some numbers. There are 7 numbers; the first 4 are your card number, the next 3 are the ‘Security Numbers’ that verify you are in possession of the card. These are the numbers you use to make Internet purchases to prove you have the card. Read me the 3 numbers”. After you tell the caller the 3 numbers, he’ll say, ”That is correct. I just needed to verify that the card has not been lost or stolen, and that you still have your card. Do you have any other questions?” After you say No, the caller then thanks you and states, “Don’t hesitate to call back if you do”, and hangs up. You actually say very little, and they never ask for or tell you the card number. What the scammer wants is the 3-digit PIN number on the back of the card. Don’t give it to them. Instead, tell them you’ll call VISA or Master card direct. VISA or Master card never ask for anything on the card as they already know the information since they issued the card! If you give the scammers your 3 Digit PIN Number, you think you’re receiving a credit. However, by the time you get your statement, you’ll see charges for purchases you didn’t make, and by then it’s almost to late and/or harder to actually file a fraud report.

Thanks to Elena (you know who you are...) for the heads-up!