According to family legend on my dad's side, my ancestors were fishing on a boat. It must've struck a rock or something, but there was a hole in the boat in middle of the sea. Had it sunk, the occupants would have drowned, and I would have never been born (as I am in this universe).
Fortunately, an eel sacrificed its life to plug the hole. And to that end, I personally honor its kin (by not eating them).