Could this mean curtains? Will the identities of our Dynamic Duo be revealed to the whole world?

9 seconds sound clip from Batman (1966) - The Joker Is Wild (S1E5) TV Series.

You can hear this line at 00:24:02 in the Blu-ray version of the movie.

Quote context

[...]

- It's my mother-in-law.

- They-they shouldn't be out with those colds.

- And now, people of Gotham City, the moment you have all been waiting for.

- The grande finale. The climax of my performance. The zenith of my career!

- The unmasking of Batman and Robin the Boy Wonder.

- Could this mean curtains? Will the identities of our Dynamic Duo be revealed to the whole world?

- Is this the end of their career as crime-fighters?

- Can they avert disaster? Answers, tomorrow. Same Bat-time. Same Bat-channel.

- We have previously seen a prison ball game.

- The Joker threw a curve... And sprung himself.

[...]