William Faulkner / Raymond Chandler / Howard Hawks: "The Big Sleep"

"Eddie Mars: Convenient, the door being open when you didn't have a key, eh? 
Philip Marlowe: Yeah, wasn't it. By the way, how'd you happen to have one? 
Eddie Mars: Is that any of your business? 
Philip Marlowe: I could make it my business. 
Eddie Mars: I could make your business mine. 
Philip Marlowe: Oh, you wouldn't like it. The pay's too small."