- That'll be the day.
- What did he say?
- He said, That'll be the day.
- What?

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

You can hear this line at 00:12:45.753 in the Blu-ray version of the movie.

Quote context

[...]

- I thought we were quite good in it.

- Good? We were great.

- Why don't you tell the boys about the Cochise picture, Morty?

- Sandy and Irving are working on it right now.

- You meet Cochise. At first, you think he's a terrible guy. You fight. Then, you get to know him, you come to respect each other, and at the end of the picture, you're friends.

- We send you boys to Baja and we shoot the picture in eight days. What do you think?

- That'll be the day.

- What did he say?

- He said, That'll be the day.

- What?

- I don't think you understand who you're talking to here.

- We have a few items we want to straighten out first, or you might be looking at three actors who really don't feel like making a Geronimo picture.

- What the hell are you talking about?

- What we're talking about is money, real money. Amigo money.

- No dough, no show.

[...]