In the book "The Serpent's Shadow" by Rick Riordan, the author presents a vivid scene that highlights the unexpected terror a hippo can evoke. Contrary to common assumptions that hippos are non-threatening, the protagonist experiences genuine fear when a massive hippo surfaces while on a boat ride. This encounter proves that even creatures not typically associated with danger can inspire moments of sheer panic.

The protagonist's humorous reflection on the situation underscores the absurdity of fearing a hippo over a shark, emphasizing the surprise of the moment. As the boat tilts dangerously and the gigantic animal appears, the character feels the collapse of their expectations, resulting in a comical yet anxious reaction. This blend of humor and suspense illustrates the unpredictable nature of adventures in the book.