Was it a Blonde?
Josie had bought herself a brand new computer and, soon after, she hooked up to her local ISP. Within a couple of hours, she had called in to the helpdesk to complain that she got an "Access Denied" message every time she tried to log in. It turned out she was typing her user name and password in capital letters. Tech Support: "OK, let's try once more, but use lower case letters." Josie: "I can't do that. I only have capital letters on my keyboard.".