I don't remember the exact name of one of the myth, but I remember the story. Some Greek god goes to some town to see how people are. Everyone treats the guy like crap, except two old people. The god says, "Thank you, I'll spare you and kill everyone else" and everyone else dies in a flood.
The old couple gets lonely, so the god tells them to plant a bunch of bones and they turn into more people.
Someone correct me if I'm wrong. I used to read Greek Mythology as a kid.