"Sorry, your password has been in use for 30 days and has expired - you must register a new one."
This is something I have to do with on a daily basis. The list sounds silly, but is spot on:
usually we are affected by all of them
science can't see what it doesn't have the language to describe
For the longest time I was thoroughly annoyed by how Ubuntu forced me to enter my password twice every time I need to switch the proxy settings.
The following BLOG entry finally solved this for me (for now)