- None of us exist at all. We're nothing but characters in Mr. Craig's dream. 
- That's right, and when he wakes up, we shall all vanish into thin air.
8 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 00:08:47.264 in the Blu-ray version of the movie.
Quote context
[...]
- And that's all there is to it?
- You never know. Perhaps it's like the Red King's dream in Alice Through The Looking Glass.
- None of us exist at all. We're nothing but characters in Mr. Craig's dream.
- That's right, and when he wakes up, we shall all vanish into thin air.
- Dear me, what a morbid notion!
- Well, you'd say I was a pretty ordinary, down-to-earth sort of person, wouldn't you?
- I refuse to commit myself. Why?
[...]

 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)