Well, we were discussing dentists. What I loathe about them is when you're helpless, your mouth full of instruments, and they answer the telephone.
11 seconds sound clip from the A King in New York (1957) movie soundboard.
You can hear this line at 00:34:26 in the Blu-ray version of the movie.
Quote context
[...]
- You know, you really are funny.
- I must tell you some of my jokes. Naughty ones!
- Yes, can't we join in the conversation?
- You see, will you open your mouth, please?
[...]