- Which is the way to Maxwell Frere's dressing room? 
- That door, monsieur. 
- Thank you.
4 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 01:20:00.137 in the Blu-ray version of the movie.
Quote context
[...]
- Well, goodnight, ladies and gentlemen. Bonsoir, mesdames. Bonsoir, messieurs. Say goodnight, Hugo.
- Goodnight, sleep tight, wake up sober.
- Et maintenant, mesdames, messieurs, je vais vous chanter...
- In far lands, where hazy mountains never end...
- Which is the way to Maxwell Frere's dressing room?
- The hulla, hulla, hulla-loobah. Dreamy tune, the boys are riding and they croon.
- Love comes on like a falling star. It's hulla, hulla, hulla-loobah.
- Come in! Glad to see you, Sylvester.
- Mix yourself a drink and let's get down to business, eh?
- Well, thanks, brother. I will.
[...]

 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)