In this story, a person at a food establishment initially refuses to share their sandwich, insisting it's too valuable to waste. However, after encountering a hungry dog, they decide to show kindness by giving the dog their sandwich. This act of generosity inspires them to offer half of their sandwich to a fellow customer in need, leading to a heartfelt exchange where both realize the importance of kindness, which doesn't cost anything. The story emphasizes that compassion can have a significant impact on others.