I have heard some theories on this type of phenomenon, that the brain stores all kinds of information such as what was heard in movies, read in books or overheard conversations that are recalled unconsciously. On the other side is reincarnation, transmigration of souls, etc. Nevertheless, it is very interesting. I speculated with my coworker that she might have seen a war movie with such a German pilot, but she could not recall or relate to such an event.
Well, I know I hear voices, just didn’t know they were from reincarnated foreigners! LOL.