Maya

“Jeez, Hazel," Percy said, "tell your horse to watch his language."
Hazel tried not to laugh. "What did he say?"
"With the cussing removed? He said he can get us to the top."
Frank looked incredulous. "I thought the horse couldn't fly!"
This time Arion whinnied so angrily, even Hazel could guess he was cursing.
"Dude," Percy told the horse, "I've gotten suspended for saying less than that...”
― Rick Riordan, The Son of Neptune

“Can we just call them storm spirits?” Leo asked. “Venti makes them sound like evil espresso drinks.”
― Rick Riordan, The Lost Hero

“Now, come over here so I can pat you down."
"But you don't have-" Percy stopped. "Uh, sure."
He stood next to the armless statue. Terminus conducted a rigorous mental pat down.
"You seem to be clean," Terminus decided. "Do you have anything to declare?"
"Yes," Percy said. "I declare that this is stupid.”
― Rick Riordan, The Son of Neptune

“Leo: "So...giants who can throw mountains. Friendly wolves that will eat us if we show weakness. Evil espresso drinks. Gotcha. Maybe this isn't the best time to bring up my psycho babysitter."
Piper: "Is that another joke?”
― Rick Riordan, The Lost Hero