In a humorous exchange, Tyson expresses surprise at seeing the stables where pegasi are kept, asking "Whathat!" This shows his curiosity and confusion about the fantastical environment around him. The mention of pegasi, mythical winged horses, highlights the magical and adventurous setting of the story.

As the conversation continues, Tyson's astonishment turns to confusion again when he sees the toilets and asks, "Whasthat!" This contrast between the extraordinary pegasi and the mundane toilets adds a clever comedic element to the narrative, illustrating the blend of the magical with everyday life that is a hallmark of Rick Riordan's writing.