I’ve noticed this for quite a long time now but I still might as well mention it. If you do something crazy (I’m not sure exactly what) like killing all the people surrounding one specific NPC, once that NPC calms down, sometimes they will call a family member or something like that.
I’ve noticed this at random like when I butchered all the guards surrounding the chef in Embrace of the Serpent, and when I killed the two other people in the Chongqing Train Station, leaving only the lady on the bench alive.