Well if you do, I'll break your neck.
4 seconds sound clip from the Palooka (1934) movie soundboard.
You can hear this line at 00:31:10 in the Blu-ray version of the movie.
Quote context
[...]
- And if frequently don't show up soon enough, we'll go looking for it.
- Please, I want Mr. Palooka to say something to the listeners.
- Well, I... I hardly know what to say, except I hope you all enjoyed the fight as much as I did.
- Well if you do, I'll break your neck.
- And, uh... and, uh, I'd like to... like to say hello to somebody else back home. Hello, Anne!
- Come on, champ. Come on. Make room for him.
- Hello, champ. Oh, you were wonderful. You were marvelous. I congratulate you.
[...]