Killers from Space (1954)
Dr. Douglas Martin: Well haven't you heard? I'm a mental case! Can't even be trusted with my own work! AHH!
Major Clift, MD: Well, Dr. Martin seems to be indestructible except for his hallucination.
Colonel Banks: Those weren't hallucinations, Colonel. Under sodium amethol, a patient loses all control of his imagination.
Major Clift, MD: Well, then, he shouldn't be able to fabricare these stories.
Colonel Banks: That's right!
Briggs, FBI: Major, you're not trying to tell us that everything he said was true?
Major Clift, MD: Look, gentlemen, I can only give you the medical facts. As for the rest - you'll have to decide that for yourselves... Excuse me, please!
Briggs, FBI: Did you ever stop to think that perhaps this Dr. Martin isn't really THE Dr. Martin?