Percy Jackson and the Olympians by Rick Riordan

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.”