Oh, by the way, it may sound strange but... I wonder if I could keep that doll for a souvenir.

9 seconds sound clip from Batman (1966) - The Joker Is Wild (S1E5) TV Series.

You can hear this line at 00:19:54 in the Blu-ray version of the movie.

Quote context

[...]

- He's not there.

- What are we to do now, commissioner?

- I just don't know.

- Well, don't worry. I'm sure the police department can handle it.

- Dick and I are already late for that Chopin concert. If you need anything, please let us know.

- Yes, I'll do that, Bruce.

- Oh, by the way, it may sound strange but... I wonder if I could keep that doll for a souvenir.

- Any use for it, O'Hara?

- Hmm, not for me.

- The sooner we get this mocking thing out of headquarters, the better I like it.

- With our compliments, Bruce. A souvenir of your narrow brush with crime.

- Thank you, commissioner.

[...]