The Doctor and Jasmine are investigating a haunted house.
DOCTOR: So you saw it coming in here? What did it look like?
JASMINE: Grey. Sort of dusty. Like it was made of spider webs.
D: And it came through the wall.
J: Yeah, that wall there.
D: But you don’t think it was a ghost. Why not?
J: Because there’s no such thing as ghosts.
D: You know, a lot of people who saw what you saw wouldn’t still think that.
J: Obviously. Otherwise there wouldn’t be idiots who believe in ghosts.