- Could he be using an alias?
- Good thinking, Robin.

5 seconds sound clip from the Batman (1966) TV series - Fine Feathered Finks (S1E3).

You can hear this line at 00:11:45 in the Blu-ray version of the movie.

Quote context

[...]

- Yes?

- The Penguin told us on that secret tape. Whatever his dazzling plot is, it involves umbrellas.

- So, he'll need a front.

- Right.

- Quickly, commissioner, send for the city records. Let's find out if anyone's opened an umbrella factory in the last three days.

- Three new umbrella factories. None of them unfortunately, in the name of Penguin.

- It's a dead end.

- Could he be using an alias?

- Good thinking, Robin.

- Chief, read me the names of those umbrella factory licenses.

- Here's RL Howard, KG Bird, EP Sherlock.

- Bird?

- K-G Bird.

- Cagey bird! The Penguin! Get it?

- Get it? Why, it's practically transparent.

[...]