Whenever a young fella shuts up and won't say anything, I've noticed it's generally on account of a woman.
4 seconds sound clip from the The Cocoanuts (1929) movie soundboard.
You can hear this line at 01:02:02.009 in the DVD version of the movie.
Quote context
[...]
- Officer, may I make a suggestion?
- How about it, you? Why did you buy this lot?
- He is a desperate character.
- None of your business. I won't say a word.
- This guy's letting on to be a dummy.
- This bird you can't understand when he does talk.
- Is there anybody here who will talk?
- I will, but I can't think of anything.
[...]