There are few killers who kill for the fun of it.

2 seconds sound clip from the The Bat (1959) movie soundboard.

You can hear this line at 00:46:46.894 in the Blu-ray version of the movie.

Quote context

[...]

- There will be a crew here shortly from headquarters, dusting for fingerprints, taking photographs.

- But in the meantime, Mrs. Patterson, you aren't leaving the house tonight, are you?

- No, Lieutenant.

- Don't, I'll talk to you in the morning. Goodnight.

- Goodnight, sir.

- Dale, I was with Mark Fleming this afternoon when you talked to him about the floor plans of this house. I heard him tell you he was coming here tonight.

- Dale called him at my request. She told me he was coming.

- Who else heard her tell you that?

- Judie, Lizzie...

- And that nice Dr. Wells.

- Dr. Wells?

- There are few killers who kill for the fun of it.

- The Bat very likely is a mental case. And I'm convinced that his crimes are motivated by his mania for personal gain.

- There's a million dollars at large. And he's going to keep on hunting for it until he lays his hands on it.

- Now, these young ladies are staying here tonight?

- Yes, they're my house guests.

- Well, when my crew arrives, we'll be busy for a while. So I'd suggest that...

- That we go to our rooms? That's a very good idea. Come on, girls.

[...]