“Surfing?” he asked. She laughed, and the sound sent a shock wave through the water. The wailing faded to background noise. Annabeth wondered if anyone had ever laughed in Tartarus before—just a pure, simple laugh of pleasure. She doubted it.”

“Laugh it up, asshole. But she who laughs last laughs longest, and I intend to belly roll tonight ~Tabitha”

“He was waving. "Saukerl," she laughed, and as she held up her hand, she knew completely that he was simultaneously calling her a Saumensch. I think that's as close to love as eleven-year-olds can get.”

“she had a laugh that hinted it had rolled around once or twice in the mud.”

“She laughed, and the desert sang.”

“So," Annabeth said, "are you going to argue about me coming along?"
"Nah. You'd just beat me up." Percy said.
She managed a laugh, which was good to hear”

“She laughed when there was no joke. She danced when there was no music.
She had no friends, yet she was the friendliest person in school.”

“When the green woods laugh with the voice of joy, And the dimpling stream runs laughing by; When the air does laugh with our merry wit, And the green hill laughs with the noise of it.”

“They signed the unwind order just to spite each other, but laugh, laugh, laugh, Hayden, because if you ever stop laughing, it might just tear you apart worse than a Chop Shop.”

“Will gave a short laugh. He was in gear as if he had just come from the practice room, and his hair curled damply against his temples. He was not looking at Tessa, but she had grown used to that. Will hardly ever looked at her unless he had to.”