- Do you have any theories, doctor?
- Perhaps.

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

You can hear this line at 00:41:28.562 in the DVD version of the movie.

Quote context

[...]

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

- Well, let's just leave it be, huh?

- We will bury it.

- If a blade passes through it like a finger through mercury, then like a river of mercury, we should be able to sever a part of it by completely separating it from the rest of the body. Firstly...

- There. Now we have a specimen.

- Fetch your dynamite, Hank.

- Do you have any theories, doctor?

- Perhaps.

- All I can tell you now is that this is a male land crab, which you as a biologist will know better than I.

- Yes, Karl, I know the species appears to be that of an ordinary land crab, but...

- Out! Quickly!

- You have destroyed McLane and all of his party.

- You have destroyed them and tried to destroy me. This, mes amis, was one grave mistake.

[...]