Doctors can have hallucinations, too.
3 seconds sound clip from the Invasion of the Body Snatchers (1956) movie soundboard.
You can hear this line at 00:33:25.565 in the Blu-ray version of the movie.
Quote context
[...]
- Stop trying to rationalize everything will you? Let's face it. We have a mystery on our hands.
- Whose body was it and where is it now? A completely normal mystery.
- I wouldn't if I hadn't looked in Becky's cellar. How do you explain away the body I saw there?
- I don't think you saw one there.
- You don't think I saw one here either?
- I know you did because three others saw it, too.
- But I dreamed up the second one?
- Doctors can have hallucinations, too.
- Nevertheless, I saw Becky's double.
- And the body that we saw here bore an uncomfortable resemblance to Jack.
- Yeah, a mighty uncomfortable.
- Alright let's go on to Becky's and have a look.
- Alright, where's your girlfriend's double?
[...]