As many have said, definitely physical security. Especially when shopping in stores. "Do you have rewards?" "Oh, yes. My number is 555-555-5555", the customer

As many have said, definitely physical security. Especially when shopping in stores. "Do you have rewards?" "Oh, yes. My number is 555-555-5555", the customer blurts out loud while there's 10 people behind them. I imagined the person walking out and getting hit with a "Thank you for shopping at Macys. Here's $500 on us!" text message. I think most would definitely fall for this, especially if they just left the store. People not locking their computers before they leave their desks also drives me crazy.