- I'm not selling anything, but plain old-fashioned Americanism.
- Some Americanism.

4 seconds sound clip from the The Best Years of Our Lives (1946) movie soundboard.

You can hear this line at 02:16:06.113 in the Blu-ray version of the movie.

Quote context

[...]

- Well, who do you think you are?

- Pay the cashier right over there.

- Coffee, please.

- Yes, ma'am.

- And there's another thing. Every soda jerk in this country has got an idea he's somebody.

- Look here, mister, what are you selling anyway?

- I'm not selling anything, but plain old-fashioned Americanism.

- Some Americanism.

- So we're all a bunch of suckers, eh?

- So we should've been on the side of the Japs and the Nazis, eh?

- Again, I say, just look at the facts.

- I've seen a couple of facts. I've seen a ship go down and over 400 of my shipmates went with it. Were those guys suckers?

- That's the unpleasant truth.

[...]