Shaming sites with dumb password rules.
Feel free to submit a pull request with dumb rules you've encountered.
Fuck
~
"
'
<
and >
in particular.
You "may use special characters", but only some of them - and we won't necessarily tell you which ones.
Financial services - where we don't allow you to create the strongest password possible.
We put punctuation in the list of unusable characters to make it additionally confusing.