- I killed it.
- Yes.
- By the sheerest luck.

4 seconds sound clip from the Attack of the Crab Monsters (1957) movie soundboard.

You can hear this line at 00:40:34.575 in the DVD version of the movie.

Quote context

[...]

- I'm here too. My leg no longer troubles me. It's all most exhilarating.

- Will you come?

- Yes. Wait for us.

- We await.

- Let's go.

- We shall need the equipment.

- We must go. We have to find out.

- We are here! Show yourself!

- I killed it.

- Yes.

- By the sheerest luck.

- Why didn't the grenades hurt it?

- Remember what the journal said about the worm?

- Yeah, that a knife passed through it like water.

- The stone penetrated its brain or motor area, or whatever keeps the thing alive.

- I think if we remove the stone, the crab would return to life.

[...]