How do you know?

1 seconds sound clip from the The Wedding Singer (1998) movie soundboard.

You can hear this line at 00:42:34.619 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, all right.

- Yay.

- I have never done it for that cheap.

- Hey, I know for a fact you gave Eric Lamensoft that price.

- I did not.

- Faye, look at me. Look me in the eyes. I'm right here, Faye. Don't look away. Tell me, did you give him that price or not?

- Okay. Just that one time. Okay, so you got me.

- Hey, you know, can I say something? Yeah, I deal with a lot of people, but you two look truly happy. You're gonna make it. I know. Believe me.

- How do you know?

- Well, you know, you can just look at a couple and you can tell right away that they're gonna stay together forever like Donald and Ivana, and Woody and Mia, and Burt and Loni.

- Oh, well, we're not getting married.

- That's right. Actually, we're brother and sister.

- Oh, so that's it. Oh, because I could sense a closeness.

- You know, the weird thing is, when we were growing up, we didn't get along, because I used to do this to her a lot.

[...]