One of our American friends, strong, speechless type.
3 seconds sound clip from the Dead of Night (1945) movie soundboard.
You can hear this line at 01:16:07.713 in the Blu-ray version of the movie.
Quote context
[...]
- Besides, I can read her thoughts.
- Read her thoughts? Why, Hugo, that's clairvoyance.
- Clairvoyance? Oh, good evening, Claire!
- Why, Hugo, he doesn't look any more dumb than I do.
- One of our American friends, strong, speechless type.
- No, Hugo, I didn't do a thing.
- Will someone please tell me what's going on around here?
- Hugo, I think we'd better move along. He's a ventriloquist.
- He doesn't look like a trick cyclist.
- No, no, I said ventriloquist.
- What, you mean the chap who makes a voice come out of a stuffed dummy? The way I do out of you?
[...]

 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)