Look, listen. You can't fool with the law. We know that was you tonight. We have an excellent description of this car.

10 seconds sound clip from the American Graffiti movie soundboard.

You can hear this line at 00:28:59 in the Blu-ray version of the movie.

Quote context

[...]

- Uh-huh. Where've you been?

- We were at the movies, sir.

- You didn't happen to be around the corner of 12th and G about 8:30 tonight, did you?

- No. No, sir. We were at the movies, like I said.

- The reason I stopped you was because the light on your license plate's out. I'm gonna have to cite you for that.

- And the front end of this thing you're driving looks a little low.

- Oh, no, sir. It's 12 and a half inches, regulation size. Now, it's been checked several times. You can check it if you like, sir.

- Look, listen. You can't fool with the law. We know that was you tonight. We have an excellent description of this car.

- I could run you in right now and I could make it stick, but I'm not gonna do that, you know why? I want to catch you in the act, and when I do, I'm gonna nail you but good.

- Happy birthday, Milner.

- Thank you, asshole.

- You're a regular. D.

[...]