X the Unknown (1956)
William Lucas: Peter Elliott
Peter Elliott : How do you explain it, sir? All this extraordinary damage just to steal an old sample container?
Peter Elliott : What happened, sir? I don't understand.
Dr. Adam Royston : Peter, I'm afraid I don't either. Yesterday the material in that container was giving a danger-point radiation reading. Now, as you just saw, it's nothing.
Peter Elliott : But that's impossible! Isn't it?
Dr. Adam Royston : Yesterday I would have said yes, but this fact is inescapable: The energy trapped in that trinium has been sucked right out of it. And furthermore, these windows were barred and that door were locked all night. So, whoever it was came in here must be... most unusual.