“Then he heard a wild, high-pitched cackling that made the hair stand up on the back of his neck. It wasn't sane, that laugh. In fact, it was the laughter of someone who never had more than a nodding acquaintance with sanity.”

“Insanity,” said Hatta, still mesmerized by his royal purple hair. “That always seemed the strangest word because it actually means out of sanity. Shouldn’t someone who’s in sanity be very sane? In means out. Curious.”“And they think we’re the mad ones,” laughed the smiling Cheshire Cat.”

“What I saw was more than I could stand. The noise I heard had been made by Little Ann. All her life she had slept by Old Dan's side. And although he was dead, she had left the doghouse, had come back to the porch, and snuggled up by his side.”

“Scully nodded. Of course. It made sense. Complete sense. No question about it. Mulder was perfectly sane in telling her all this. And she was perfectly sane in listening to it and nodding and urging him to tell her more. It was the rest of the world that was-She doubled over as a wave of laughter hit her.Mulder looked at her and started laughing too. They stood there in the cemetery in the darkness and the drizzle, laughing their heads off.'You know we're crazy,' Scully finally said.'Of course we are,' Mulder gasped out.”

“Puck laughed, and it wasn't like that weird high-pitched giggle she'd heard out of children before, the one that begged the question: why would one possibly tickle a child just to elicit that noise? ”

“...and with that he began to laugh, not a laugh either, but a cackle, a hideous cackle like a rooster with its head on the block. It got him so badly that he had to stop and hold his guts; the tears were streaming down his eyes and between the cackles he let out the most terrible heartrending sobs.”