All right to Rick for these quotes 
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What if we promoted, like, Adidas shoes?' Percy wondered. 'Would that make Nike mad enough to show up?" Leo smiled nervously. Maybe he and Percy did share something else – a stupid sense of humor. "Yeah, I bet that would totally be against her sponsorship deal. THOSE ARE NOT THE OFFICIAL SHOES OF THE OLYMPICS! YOU WILL DIE NOW!"' - The Blood of Olympus- Percy, and Leo
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'"Let us find the dam snack bar," Zoë said. "We should eat while we can"
Grover cracked a smile. "The dam snack bar?"
Zoë 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 Zoë 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."' - The Titan's Curse - Zoë, Thalia and Grover
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And last but not least my favorite quote:
'"With great power... comes the great need to take a nap. Wake me up later."' - The Last Olympian- Nico di Angelo
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VoldemortOnTheArgoII