Reminds me of a similar story. A priest, a minister and a rabbi are fishing on a boat. While lazily passing the time on a beautiful summers day they get into a discussion about when does life begin.
The priest says, life begins at the moment of conception.
No, no, no, says the minister, life begins when the child is born.
My learned friends, says the rabbi, I'm afraid you are both wrong. Life begins when the kids leave and the dog dies!