- I don't get it. 
- Don't you? No, I suppose you wouldn't.
4 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 01:27:31.857 in the Blu-ray version of the movie.
Quote context
[...]
- I'm just going up to my room, and I'll see you home. 791
- Oh, Joe wouldn't do a thing like that. He's sore, but...
- Joe? You thought I meant? That's good. That's really funny. No, I didn't mean Joe.
- Don't you? No, I suppose you wouldn't.
- You just think I'm drunk, don't you?
- You're not acting like you're on the water wagon.
- Well, you'd drink too, if you were in my shoes. I tell you... it's enough to drive a man mad.
- Why don't you grab yourself some sleep?
[...]

 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)