"Yea, Jung was into the collective dream, the archetype that trascends cultures. I've read his stuff, all of it, it is interesting, but how can you prove any of it?"
Davidal,
There is a huge difference between a "positive" or "predictive" science and a "hermeneutic" science. Psychoanalysis--whether Freudian or Jungian or otherwise--belongs in the latter category where the concept of "proof" is entirely different from that of a predictive science.