"The Ungrateful Son" is a cautionary tale about a man who hides a roasted chicken from his elderly father out of selfishness. As punishment, the chicken transforms into a large duck that clings to his face, causing him pain and preventing anyone from removing it. The man eventually realizes his wrongdoing, confesses his greed to his father, and asks for forgiveness. Upon receiving it, the duck turns back into the chicken, allowing them to share the meal. The story emphasizes themes of gratitude, respect for elders, and the consequences of greed.