One hat left, the key that will hoist our opponent on his own petard!
8 seconds sound clip from Batman (1966) - Batman Stands Pat (S1E14) TV Series.
You can hear this line at 00:07:30 in the Blu-ray version of the movie.
Quote context
[...]
(Batman anti-crime computer processing)
- A dozen, a collection of 12 such as a dozen men or women.
- Or.... a dozen men and women! A jury, jurors!
- Of course, that's what he was after: the 12 hats of the jury that convicted him.
- And the jurors, Madam Magda, the chef, the fire chief they were all on that jury.
- How could I have been so stupid?
- Oh no, Batman, you've been pretty busy.
- One hat left, the key that will hoist our opponent on his own petard!
- Yes, I-I realize that. Charlie, hold on a second, will you please?
- Yes but it may take a little while, I'll call you back.
- Right.
[...]