" Scully-'
'I screwed up.' Her hands again. 'Damnit, I screwed up.'
'Nope' [Mulder] said... 'If I was dead, then you would have screwed up.' She saw the grin. 'Then I'd have to haunt you.'
'Mulder that's not funny.'
'But you don't believe in ghosts and goblins... "

― Charles L. Grant , The X-Files: Goblins (The X-Files #1)