Document it!
Typed the password to your Facebook Profile and realized the Password error is showing up.
Stuck in a situation where a certain financial transaction have to occur and realized that the transaction pin you entered is incorrect. On top of that you don't even remember the password of the email where the reset password pin has to arrive.
Either you are careless or you are unorganized. If you are careless, then only circumstances shall teach you and not this article. However if you care then you better be organized. It shall take a minimum of 5 minutes per Month to document your data secure at one place. Whether it be a paper in your wallet or your locker in your Mobile Device.
Your Brain is designed for Creativity. Don't use it as Hard Drive.?