What did you do that for, boss? Now you'll never get his cowl.

7 seconds sound clip from Batman (1966) - The Thirteenth Hat (S1E13) TV Series.

You can hear this line at 00:23:06 in the Blu-ray version of the movie.

Quote context

[...]

- Not till I get your cowl, Batman. My thirteenth hat.

- Cappy, Dicer, what are you waiting for?

- I prepared myself with my anti-mesmerizing Bat-reflector.

- Holy ricochet.

- Robin, old chum!

- What did you do that for, boss? Now you'll never get his cowl.

- When the plaster hardens and is removed, I'll get a mold of his cowl. Not only that, but Batman would be permanently plastered.

- Oh, it's a far, far simpler end for the cowled crusader.

- And the flailing knives mechanical stretchers, cylindrical chambers, acid sprays and suction fans of my hat factory.

- Oh, it's a stroke of genius on my part if I do say so myself.

[...]