Night Vale podeast
When a person dies and no one will miss them, the mourning is assigned to a random human.
This is why you sometimes just feel sad.
From now on if anyone asks me why an randomly sad...instead of saying don't know" or something I'm going to look them dead straight in the eyes and say "I've been assigned to mourn the death of a stranger" and just walk away
Good to know there's a worthwhile reason behind it