The day you try to put anything over on me will be a costly one for both of you.

5 seconds sound clip from the The Treasure of the Sierra Madre movie soundboard.

You can hear this line at 00:46:07.000 in the Blu-ray version of the movie.

Quote context

[...]

- Where's dobbs?

- Poking around in the dark out there.

- He's sure taking a long time out there. I think I'll go have a look-see.

- Where's Curtin?

- He's out there somewhere. Said he was going to have a look-see.

- It's come around to me again, but I won't take my turn if you guys will stop worrying about your goods and go to bed. We got work to do tomorrow.

- You can't catch me sleeping. Don't you ever believe that. I'm not that dumb.

- The day you try to put anything over on me will be a costly one for both of you.

- Any more lip out of you, and I'll haul off and let you have it.

- If you know what's good for you, you won't monkey around with Fred C. Dobbs.

- Ought to get a load of Dobbs. He's down there talking to himself a mile a minute.

- Yeah, something's eating him, all right. I don't know what. He's just spoiling for trouble.

[...]