Ameli.fr (French national health insurance) Website→

This was very painful to find a password that works with this one and that I can actually remember (I ended-up using my bank-account number because everything else failed). It took me maybe one hour and I thought I would become crazy (and yes, the session expires frequently while you are actually thinking about a password).

• The password must be more than 8 characters
• But you cannot use more than 13 characters
• You can only use digits
• You cannot use your birthdate or your login
• You cannot use a sequence of digits (if your password happens to contain 56 or 89 it will be rejected)
• You cannot repeat the same character (if your password contains 22 or 55 it will be rejected)