Oh, it must be some sort of prank.
5 seconds sound clip from Batman (1966) - The Entrancing Dr. Cassandra (S3E25) TV Series.
You can hear this line at 00:11:34 in the Blu-ray version of the movie.
Quote context
[...]
- Would you like the diamond gift-wrapped, madam?
- We should have heard from them by now. I'm worried.
- I'm sure there's nothing wrong, commissioner. Batman's never failed us yet.
- A Batfight seldom takes more than 40 seconds and they're already half an hour late.
- Oh, they should be coming through that door right now.
- Oh, it must be some sort of prank.
- I can't believe my eyes, commissioner, but I must believe what I feel... And I feel their pulse.
- We've had six medical opinions and each one confirms the one before.
- You know how those doctors stick together.
- Nevertheless, the fact remains that there is no known medical way to restore them.
[...]