Oh, you mean there's a ghost as well as a skeleton in everyone's cupboard? That's a pretty thought.
5 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 01:11:31.339 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, thank you, my dear. That's very kind of you.
- Oh, Mr. Craig, now that you've met us, I'm sure you wouldn't dream of dreaming about us again.
- Perhaps they aren't so extraordinary. Perhaps they happen to most people.
- Oh, you mean there's a ghost as well as a skeleton in everyone's cupboard? That's a pretty thought.
- And what's the ghost in your cupboard, doctor?
- My friend Maurice Olcott, who was defending the case, wanted my opinion on the state of his mind.
- Hello, Frere. This is Dr. Van Straaten. He's going to help us with the case.
[...]

 Dead of Night (1945)
 Dead of Night (1945)  Phantom of the Opera (1943)
 Phantom of the Opera (1943)  Scooby-Doo, Where Are You! (1969)
 Scooby-Doo, Where Are You! (1969)  Halloween III: Season of the Witch (1982)
 Halloween III: Season of the Witch (1982)  Knight Rider (1982)
 Knight Rider (1982)