Well, I could tell you that, but then I'd have to kill you.
11 seconds sound clip from the American Psycho movie soundboard.
You can hear this line at 00:26:00 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, jeez, Patrick... I mean, Marcus, what are you thinking?
- Why would Ivana be at Texarkana?
- So, wasn't Rothschild originally handling the Fisher account?
- Well, I could tell you that, but then I'd have to kill you.
- I like to dissect girls. Did you know I'm utterly insane?
- Great tan, Marcus. Really impressive. Where do you tan? Salon.
- I've got a tanning bed at home. You should look into it.
- And Cecilia... How is she? Where is she tonight?
- Cecilia is... Well, you know Cecilia. I think she's having dinner with Evelyn Williams.
[...]