If he were wrong, that would prove it.
3 seconds sound clip from the 2001: A Space Odyssey (1968) movie soundboard.
You can hear this line at 01:25:19 in the Blu-ray version of the movie.
Quote context
[...]
- I've got a bad feeling about him.
- You do?
- Yeah. Definitely. Don't you?
- Unfortunately, that sounds a little like famous last words.
- Still, it was his idea to carry out the failure mode analysis, wasn't it?
- Should certainly indicate his integrity and self-confidence.
- If he were wrong, that would prove it.
- It would be, if he knew he was wrong.
- Look, I can't put my finger on it, but I sense something strange about him.
[...]