If you don't know the password to your system it can't be forced out of you.

For example, if you have a password algorithm that takes an input value (lets say a website name) and a seed that is stored on your system somewhere (that you don't have memorized), concats them together and then hashes the result to generate the password, the rubber hose attackers would to both beat the input value out of you and have physical access to the machine your seed is stored on to recover the password.