Dumb Password Rules
dumbpasswordrules.com
dumbpasswordrules.com
I don't know what percentage of non-geek users being forced to often change their password, choose something not very similar to their current password. I've seen dozens if not hundreds patterns like attaching month number, month name or week number to the same string, like kid's, dog's or company name. Or yellow sticky paper with password underneath the keyboard or even on the monitor.
especialyifwithmistakez
memberablethatisiflongenough