I think you tend to overestimate the Penguin, Mayor Linseed.

6 seconds sound clip from Batman (1966) - Hizzonner the Penguin (S2E17) TV Series.

You can hear this line at 00:05:21 in the Blu-ray version of the movie.

Quote context

[...]

- I suspect Penguin has done his civics homework well and has discovered that Paragraph 34-A of the city charter has never been officially repealed. It specifically allows convicted criminals to run for public office.

- Holy disaster area.

- I don't think there's any danger of the Penguin being elected, Robin. The people of Gotham City are not as simpleminded as he might think.

- Thirteen, please.

- I'm glad you two are here, Dynamic Duo. I wanted a chance to say goodbye.

- I think you tend to overestimate the Penguin, Mayor Linseed.

- The Gotham City News Dealers' Association doesn't overestimate him. They endorsed him.

- Thanks to those shenanigans he pulled this afternoon.

- The same shenanigans got him the endorsement from the Gotham City Charity Fund.

- Not to mention the East Coast Bird Lovers' Society. Commissioner?

[...]