- How will I know them?
- You will know them. You will most certainly know them.

7 seconds sound clip from the Three Amigos (1986) movie soundboard.

You can hear this line at 00:19:20.786 in the Blu-ray version of the movie.

Quote context

[...]

- I'm looking for a man by the name of El Guapo. Do you know this man?

- Perhaps, senor.

- Hey, where'd you get that pretty little gun?

- El Guapo will be interest to see me. I have something he wants.

- Hey, I'm talking to you. Where'd you get that pretty little gun?

- I'm meeting some friends of mine here. When they get here, tell them to wait.

- How will I know them?

- You will know them. You will most certainly know them.

- Hey, why don't you come over here and sit on my lap? I wanna show you something, honey.

(GUNSHOTS IN THE BAR)

- Anyone else with a comment?

- Some friends of mine will be coming here. I hope you will show them more courtesy than you have shown me. They aren't as kindhearted as I am.

[...]