- You can, darling, if you try. 
- It's no good. 
- You can. Look, here I am, standing by you.
8 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 00:42:28.571 in the Blu-ray version of the movie.
Quote context
[...]
- The walls are panelled. There's a log fire burning in the grate.
- It's no use, I tell you! I am going mad.
- No.
- Or me?
- No.
- But you must! Make yourself.
- I can't.
- You can, darling, if you try.
- You can. Look, here I am, standing by you.
- Yes. Yes, there you are. I can see you now.
- Come on, let's get out of here and have a drink.
- So that seemed to be that. A fortnight later, we got married and moved into the new house.
- Mother says, can we come down the weekend after next. It's her birthday.
[...]

 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)