~Theoretically, you could figure out every book you've ever
  read, every TV show and movie you've ever seen, every website
  you've ever visited. Also theoretically, you could trace back a
  large percentage of the names of people you've ever known, from
  school, work, neighborhood, online. Then to each you could make
  sublists of "What makes this [x] meaningful to me?" and add
  things until you can think of no more. Where you could go from
  there, I don't know honestly. But there's a lot of potential
  data collection that could make such an effort partially
  possible. Of course, the same two people can read the same
  books, TV shows, movies, know the same people, have nearly
  identical experiences yet are entirely different. Still, it
  could be an interesting project. == Quite true - yet what about
  the subconscious influences? There could be underlying
  assumptions that guide the rationalizing process that you might
  not be directly cognizant of but could be revealed by knowing
  the entirety of influential input. Perhaps things you haven't
  used yet. Something from a movie you saw when you were 10 that
  hasn't yet been needed - its influence not required just yet,
  but one day its significance shows itself through life
  circumstance. That sort of thing. For a decent AI, it would not
  only have to capture the present and the past but would have to
  be able to predict potential futures. ==