The closest thing to anything

Is it to possible to know someone that you never known? That's the question which is knocked at my head since a very long time. There's no such strange feeling than a "déjà-vu". Almost everybody will argue that making an error is better than make nothing and that exactly what I thought (except a few hours sooner). There's nothing essential in what happened. That means nothing, a wasting time that none would find useful. I am merely a bit annoyed and uncomfortable...