It is actually fairly common practice especially with businesses where an account is communal for example a shared login to an email system for the password to be written down. Sometimes it's even written on the actual case of the monitor itself or attached to it in the form of a post-it note or the like. However more secure passwords are likely to be harder to crack. Though when new starters begin in a job it would be fairly common practice for them to write down such things as passwords they are given initially which in some cases these will never change.

Once a password has been personalised however, forget it. You could find out that my password for EoFF for example is a quote from William Shakespeare but which one, I could have it set to something from my favourite play of his (that would be Macbeth) but would I necessarily use something obvious? Even if I did how about the various ways I could corrupt the spelling of such a quote to make a password strong, numerals for letters, punctuation marks in random places, shifting case letters. As an example here are 4 corruptions of 'To be or not to be' from Macbeth; '2bornot2b', 'ToB.0r.Not2b?', 'To.be.0r.n0t.to.be?' '280rn0728?' all are valid passwords and would trigger most password systems to rate the password as strong. In the end, unless your password system to begin with is pretty basic only allowing letters and there is a character limit in place, the chances of cracking it would be impossible without dedicated software to do it for you.

Now before y'all go running off and experiment trying to crack my password with quotes from Macbeth, I'm not a fool. That was just an example of what my password could be using the original post's rules. I think more games ought to include software hacking tools such as electronic cracking programs rather than the 'Hey here's the password to the system' documents that we see but then how can a game developer include features which encourage exploration and yet somewhat artificially increase the length of the game by having you hunt for half an hour around a location for a password.