That is Dr. Weigand's small secret. Let us catch him and find out.
5 seconds sound clip from the Attack of the Crab Monsters (1957) movie soundboard.
You can hear this line at 00:23:30.308 in the DVD version of the movie.
Quote context
[...]
- Let's get back to the house and get some coffee.
- Oh, I thought you were the boogeyman.
- I thought we heard a girl screaming during the quake.
- Did part of the cliffs fall away into the sea?
- We must go faster, there is very little time.
- That is Dr. Weigand's small secret. Let us catch him and find out.
- Doctor, why did you try to stop me from throwing that rock?
- I just don't like to kill anything, even such ugly creatures as these.
- That's all the more reason to get Jim out of that pit.
- Now, what do you want with McLane's journal now, honey?
[...]