Free topic: Déjà vu effect

 This time i want to talk about that feel, that typical phrase: "i already lived this moment" ,"wait, this feels like i live this moment before" and we say "Déjà vu" .But, what is a Déjà vu?, first: the phrase is in French, and means "it has been seen". The feeling of familiarity with things or experiences that one should not have, but that feels deeply that we lived them. when you are with friends and feel you already been talking about those issues, in the same position, its something very curious... and makes me wonder, what it really is?, searching, i found theories from different areas, the psychoanalytical people describe it as a "invention" of our subconscious as a fantasy for  "feeling right"  and okay with a situation. However psychiatrist describe it as a des-phase in the brain, the fact of confusing the present with the past and a very momentary "failure" in the temporal lobe in the brain, site in charge of memory. Another theory, according to physicist its kinda sci-fi i think, but its realy fascinating think about it: parallel universes in the tuning with ourselves, or a  "fracture momentary" with this dimensions. Maybe i like too much the sci-fi haha, but well, what do you think about it?  Do you have another theory?  have you had Déjà vus? if the answer was yes, how often do you experiment Déjà vu?