Les Martin said this quote
“ 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. ”