These 2 guys came in my Great-Grandma's house trying to sell her home security. I sat back and just watched thinking she was smarter than what she really is. They asked for her credit card and said "Were going to have to take this down to the office to get a copy, I will also need your full name, SSN number, and date of birth."
She gave it all. When they left I said "Sooo, might as well drive you to the bank so you can cancel that card." She said "We can't go anywhere! They're gonna be back in 10 minutes." They never came back. I just laughed. Bank called the next day asking if she knows her credit card has been maxed out in 3 hours. I got the blame.