"Hey, Walter, it's Bob Grabowski in Studio City, branch 38," the caller said. "I need you to pull a sig card on a customer account and fax it to me." The sig card, or signature card, has more than just the customer's signature on it; it also has identifying information, familiar items such as the social security number, date of birth, ,mother's maiden name, and sometimes even a driver's license number. Very handy to a social engineer.