The Mechanic

Arthur Bishop:
That was pretty cold.

Steve McKenna:
I knew she wouldn't do it.

Arthur Bishop:
But, had she done that, would be willing to pick up the tab?

Arthur Bishop:
You always have to be dead sure. Dead sure or dead.

Arthur Bishop:
It takes a special kind of person to do that.

Steve McKenna:
I can dig it.

Arthur Bishop:
You say you can "dig it". But, the fact is that you don't know what you're talking about.

Steve McKenna:
You do?

Arthur Bishop:
Do I?

Steve McKenna:
Interesting. When he's cornered, he answers questions with questions.

Steve McKenna:
You're, uh, gonna be dead in five minutes.

Arthur Bishop:
Murder is only killing without a license.

Arthur Bishop:
[When Arthur is explaining to Steve about the rules in the martial art scene] They won't hit each other or one of them would dead and that's against the law.

Steve McKenna:
Chicken Lickin' is lickin' chicken.

Security Camera Thug:
Wise guy.

[last lines]

Arthur Bishop:
[voiceover as Steve reads note] Steve, if you read this, it means I didn't make it back. It also means you've broken a filament controlling a 13-second delay trigger. End of game. Bang! You're dead.

Steve McKenna:
You do this for money?

Arthur Bishop:
Money is paid, but that's not the motive. It has to do with standing outside of it all, on your own.