The answer to your question is: Go to the mattresses. You're at war. It's not personal, it's business.
9 seconds sound clip from the You've Got Mail movie soundboard.
You can hear this line at 00:49:54.452 in the Blu-ray version of the movie.
Quote context
[...]
- Oh. What is it with men and The Godfather? Hello?
- Oh, come on. Hello? Well... Well, what can I... Michael...
- What should I pack for my summer vacation?
- 'Leave the gun. Take the cannoli.'
- 'Monday, Tuesday, Thursday, Wednesday.'
- I know you worry about being brave. Don't. This is your chance. Fight! Fight to the death!
- It's not personal. It's business. Just fight! Fight, fight, fight!
- Hey.
- Hey.
- What?
- I've decided to go the mattresses.
- Do you think it would be a gigantic conflict of interest if you wrote for me about the store?
- Yes.
- Yes?
- No.
[...]