Hm. Uh, you see, my voice-eraser electronically loosened their vocal chords and, just have them spray it and it'll tighten them right back up again.

15 seconds sound clip from Batman (1966) - The Bat's Kow Tow (S2E30) TV Series.

You can hear this line at 00:20:54 in the Blu-ray version of the movie.

Quote context

[...]

- Yes, Catwoman, one of your very best.

- Thank you.

- But still the problem remains. How do we undo what you did?

- The stolen voices?

- Yes.

- Oh, well, you just, uh, have them all spray their throats with the atomizer. Get them back to normal in seconds. Heh.

- Amazing.

- Hm. Uh, you see, my voice-eraser electronically loosened their vocal chords and, just have them spray it and it'll tighten them right back up again.

- Amazing. (2)

- Batman, when I get out of jail, will you take me on a date?

- Well, I have plenty of time to think about that, Catwoman. Several years, I'm afraid.

- If I were to kiss you, would you think I was a bad girl?

- But, uh... No. No, of course not, Catwoman.

[...]