- I'll lend a hand, if I may? 
- Oh, thank you, my dear. That's very kind of you.
3 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 01:11:09.208 in the Blu-ray version of the movie.
Quote context
[...]
- You succeeded, where I failed Eliot. And in a double sense.
- Yet the horror hasn't started, has it?
- 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?
[...]

 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)