There's a funny story I've read about changing passwords. I will edit it slightly for this family friendly site:
Choose a new password :
potato
Sorry, password must contain at least 8 letters.
boiled potato
Sorry, password must contain at least one number.
1 boiled potato
Sorry, password cannot contain spaces
50freakingboiledpotatoes
Sorry, password must contain capital letters.
50FREAKINGboiledpotatoes
Sorry, capital letters must not be consecutive.
IwillShove50FreakingBoiledPotatoesUpYourA$$,IfYouDoNotGiveMeAccessImmediately
Sorry, password must not contain punctuation.
NowIamSeriouslyGettingPi$$edOffIwillShove50FreakingBoiledPotatoesUpYourA$$IfYouDoNotGiveMeAccessImmediately
Sorry, you can't change your password to a password that has already been used. Choose a new password :