In "The Lightning Thief," Percy expresses his frustration over the choices made by the gods in Greek mythology. Referring to the olive as a symbol of wisdom, he sarcastically remarks on the preference for olives, questioning their importance. His light-hearted tone reflects his disbelief that such a seemingly mundane choice could be revered.

Percy's comment highlights the absurdity of valuing olives over more universally loved foods like pizza. This showcases his relatable perspective and his way of coping with the challenges he faces while navigating the world of gods and monsters. The humorous exchange adds depth to his character as he balances humor with the seriousness of his quest.