Why do you laugh? Surely this is not a laughing matter.
4 seconds sound clip from the Bride of the Monster (1955) movie soundboard.
You can hear this line at 00:39:41.956 in the Blu-ray version of the movie.
Quote context
[...]
- In Paris, I missed you by a month. In London, a week. At Loch Ness, by only one day.
- The monster of lake Marsh sounded again like you.
- Why the sudden interest in me, professor Strowski?
- Your experiments in atomic energy, of course.
- Ah, so my dear country now believes in my work. And that it can be a success.
- Why do you laugh? Surely this is not a laughing matter.
- My dear professor Strowski...
- Now, here in this forsaken jungle hell, I have proven that I'm all right!
[...]