How can you be so sure? Have you tested this theory?
6 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.
You can hear this line at 00:24:12 in the radio play.
Quote context
[...]
- I appreciate the need for security, Professor.
- I have not quite fathomed the problem, even with your remarkable assistance, Mr. Carpenter.
- Let's look at it, sir. All you have to do now is substitute this expression at this point.
- Yes. That will reproduce the first order term, but what about the effect of the other terms?
- With variation of parameters, this is the answer.
- How can you be so sure? Have you tested this theory?
- I find it works well enough to get me from one planet to another.
- Klaatu!
- I spent two days at your Walter Reed Hospital. I was interviewed...
- I need no proof. This blackboard is proof.
[...]
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Actors: Michael Rennie (Klaatu), Jean Peters (Helen Benson), Paul Frees (Narrator), Lamont Johnson (Tom), Herb Butterfield (Professor Barnhardt), Tudor Owen (Mr. Harley), Billy Gray (Bobby), Edith Evanson (Mrs. Crockett)
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