No, sir, I'm over 21...
3 seconds sound clip from the Dark Command (1940) movie soundboard.
You can hear this line at 00:07:39 in the Blu-ray version of the movie.
Quote context
[...]
- No hurry, doc. Take your time.
- I wanna look this country over good.
- Well, if you ain't the contrariest critter I've ever seen.
- I won't warn you again. Now put that gun away. Give me that gun, I say.
- Well, I'm gettin' tired of being treated like a kid.
- Mary!
[...]