In "I Was a Rat!" by Philip Pullman, a young boy named Roger is discovered by a couple, Joan and the receptionist, who realize he believes he has been transformed into a rat. This peculiar situation draws attention as they try to understand what might have happened to him, leading to questions about his true identity and the possibility of an injury that could have caused this bizarre belief.
Joan expresses her concern for the boy, suggesting that he may have hit his head, which adds a layer of mystery to his condition. The receptionist, intrigued by the situation, begins to document it, hinting at the unfolding tale that involves unexpected twists and deeper themes about identity and transformation.