Think you've found the perfect password to fit this complicated bill? Great. Now change it frequently and completely.
But don't write it down!
The last time I had to create yet another encrypted monstrosity, it was a stressful day. My new password reflected this state of mind, but I assumed it would be my little secret for the next couple of months.
As it turned out, it was only private until I needed tech support a few weeks later.
IT person: "I can fix that issue. I'll just need your network password."
Me: (pause) "You want me to just ... tell it to you?"
IT person: "Go ahead."
Me: "Um, okay. It's [a series of numbers and symbols], followed by s-o-d-e-p-r-e-s-s-i-n-g."
IT person: "Are those esses or effs?"
Me: "Esses ... like ... depressing."
There was a very long pause.
Me: "I was in a really bad mood the last time I was prompted for a password change."
IT person: "Yeah. I can see that."
The web address for this moment begins with FML.