If I thought my hair knew what my brain was thinking, I'd shave it off and wear a wig.
6 seconds sound clip from the Waterloo (1970) movie soundboard.
You can hear this line at 00:54:56.802 in the Blu-ray version of the movie.
Quote context
[...]
- Obviously, he's no student of Caesar. He's positioned himself badly. He has the trees at his back.
- We'll give him no provocation. Maybe he'll leave tonight.
- Come on, come on. You're nosing your way right into the pot. There you are!
- Look, keep quiet and I'll only eat half of you.
- Forgive me, sir, but if you took the troops into confidence, they would know what they were about.
- If I thought my hair knew what my brain was thinking, I'd shave it off and wear a wig.
- Here comes old Atty. Get to your feet.
- Your old friends, sir. The Enniskillen.
- I hang and flog more of them than I do the rest of the army put together.
- Me, sir?
[...]