I wanna see a negative before I provide you with a positive.

4 seconds sound clip from the Blade Runner (1982) movie soundboard.

You can hear this line at 00:18:26 in the Blu-ray version of the movie.

Quote context

[...]

- We call it Voight-Kampff for short.

- Mr. Deckard, Dr. Eldon Tyrell.

- Demonstrate it. I wanna see it work.

- Where's the subject?

- I wanna see it work on a person.

- I wanna see a negative before I provide you with a positive.

- What's that gonna prove?

- Indulge me.

- On you?

- Try her.

[...]