Keep practicing.
3 seconds sound clip from the Batman (1966) movie soundboard.
You can hear this line at 00:29:00 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, Batman. Hello, Batman. Ahoy. What can I do for you?
- Hello, Admiral. A routine question.
- Have you recently sold any war surplus submarines? And if so, to whom?
- Oh, just a moment. I'll have to look that up.
- We disposed of a war surplus submarine last Friday-a preatomic model to some chap named P.N. Gwynne.
- Did this P.N. Gwynne leave an address?
- Just a post office box number. Would you like it?
[...]