Ellen

“Like water leaking through a dam," said Piper.
"Yeah," smiled Percy. "We've got a dam hole."
"What?" Piper asked.
"Nothing," he said. "Inside joke.”
― Rick Riordan, The Mark of Athena

“Frank stared at him. "Unfair? You can breathe underwater and blow up glaciers and summon freaking hurricanes-and it's unfair that I can be an elephant?"
Percy considered. "Okay. I guess you got a point. But the next time I say you're totally beast-"
"Just shut up," Frank said. "Please."
Percy cracked a smile.”
― Rick Riordan, The Son of Neptune

“Hercules,huh? Percy frowned. "That guy was like the Starbucks of Ancient Greece. Everywhere you turn--there he is.”
― Rick Riordan, The Mark of Athena

“Behold!" Percy shouted. "The god's chosen beverage. Tremble before the horror of Diet Coke!”
― Rick Riordan, The Mark of Athena