“
That’s another thing about ghosts, a very important thing—you have to be careful, because hauntings are contagious. Hauntings are memes, especially pernicious thought contagions, social contagions that need no viral or bacterial host and are transmitted in a thousand different ways. A book, a poem, a song, a bedtime story, a grandmother’s suicide, the choreography of a dance, a few frames of film, a diagnosis of schizophrenia, a deadly tumble from a horse, a faded photograph, or a story you tell your daughter. Or a painting hanging on a wall.
”
”
Caitlín R. Kiernan (The Drowning Girl)