User blog comment:Waybig101/Movie Ideas/@comment-1824169-20161204014432/@comment-24922135-20161204021452

I dunno, I'm not your writer so it isn't my responsibility to come up with this.

If I were writing this, I'd either leave it unexplained or explain it off as some kind of 'genetic imprint' or a nanomachine virus or some such crap.