I'd probably have to reread to have it kick me as to exactly what, but I've got a short list of guesses from a particular fandom which I will not name so that you need neither deny nor confirm.

If you're curious, feel free to email me your guesses. :)

amberfox could probably hack all my passwords, given time and thought. She knows one of them, so it would get her started. Chris knows two iterations of my password, but would never be able to figure the rest out. My ex, Mark, knows my PIN number and the reasoning behind it, but since it bears only a vague resemblance to my current password-schema, and he knows nothing about the literature of the current schema, would not be able to figure anything out from there.