Shita-Kiri Susume is about a man and his mean-spirited wife. The man feeds a sparrow everyday.
One day, he leaves and asks his wife to feed the sparrow. Instead of feeding it, she cuts out its tongue. Upon returning, the man finds the sparrow on top of a mountain and is offered the choice of one of two baskets.
He chooses the smaller because he is old and it turns out to be full of treasure. Upon hearing about this, his wife heads up the mountain for the larger basket, which is full of vipers who scare her/kill her. The intended values portrayed in the story are regarding the positive effects of friendship and the negative effects of greed. You should look up the original story, it