de javu? though there aren't much concrete reliable scientific explanation on this matter, i believe this have very much to do with parallel universe theory. whereby there are many variables of result that can come off from the same action then the fruit of said action then may causes a chain affect of after results and its a cycle of the same thing.

of course it is impossible to have different results in this current time and in this current universe, but it could be a clash of results that when it involves ourselves, thus us having a feeling of something has happened before.