That's where the blindfold part would come in, sir.
4 seconds sound clip from Batman (1966) - Batman Is Riled (S1E6) TV Series.
You can hear this line at 00:10:13 in the Blu-ray version of the movie.
Quote context
[...]
- Uh, no, sir. Grammar. The sentence was grammatically incorrect.
- One does not laugh good, sir. One laughs well.
- Why, that's it. Laughs well. Laughwell. Professor James J. Laughwell.
- That's where the blindfold part would come in, sir.
- And they're being stored at the Last Longer Warehouse.
- We'll use the Bat-rope and take them by surprise. Stand clear.
- No matter what, we mustn't fail this time, Robin.
- Sometimes I think people expect too much of us, Batman.
- They have a right to expect it.
[...]