Yeah. How do you know?
3 seconds sound clip from the The Roaring Twenties (1939) movie soundboard.
You can hear this line at 00:24:38 in the DVD version of the movie.
Quote context
[...]
- Well... So long, Eddie. I'll see you in September.
- Shut up!
- That won't help. I tried it.
- This ain't no jail, it's a madhouse.
- We all got the stamp on us. We can't sit still.
- We've seen too much action, too much blood.
- They think after that we can just sit and twiddle our thumbs. We can't.
[...]