Retained

“Grover was sniffing the wind, looking nervous. He fished out his acorns and threw them into the sand, then played his pipes. They rearranged themselves in a pattern that made no sense to me, but Grover looked concerned.
"That's us," he said. "Those five nuts right there."
"Which one is me?" I asked.
"The little deformed one," Zoe suggested.
"Oh, shut up.”
― Rick Riordan, The Titan’s Curse

“What if it lines up like it did in the Trojan War ... Athena versus Poseidon?"
"I don't know. But I just know that I'll be fighting next to you."
"Why?"
"Because you're my friend, Seaweed Brain. Any more stupid questions?”
― Rick Riordan, The Lightning Thief

“Let us find the dam snack bar," Zoe said. "We should eat while we can."
Grover cracked a smile. "The dam snack bar?"
Zoe blinked. "Yes. What is funny?"
"Nothing," Grover said, trying to keep a straight face. "I could use some dam french fries."
Even Thalia smiled at that. "And I need to use the dam restroom."
...
I started cracking up, and Thalia and Grover joined in, while Zoe just looked at me. "I do not understand."
"I want to use the dam water fountain," Grover said.
"And..." Thalia tried to catch her breath. "I want to buy a dam t-shirt.”
― Rick Riordan, The Titan’s Curse

“Hades raised an eyebrow. When he sat forward in his throne, shadowy faces appeared in the folds of his black robes, faces of torment,as if the garment was stitched of trapped souls from the Fields of Punishment, trying to get out. The ADHD part of me wondered, off-task, whether the rest of his clothes were made the same way. What horrible things would you have to do in your life to get woven into Hades' underwear?”
― Rick Riordan, The Lightning Thief