Well, if you put in xuui-659995!?)) then it won't let you use this either. How does that make any sense?
Edit: In fact, interestingly I used a pseudo-"random" generator made up in my brain. And there you have a big problem - I couldn't help myself but I grouped letters, numbers and special characters.
I have to ask - if most of us do this, as we pick our own passwords, then don't we by our very nature make it easier to crack our own passwords?