Try asking a major star to play a real Mafia head, a man who makes a living off whores and child pornography, heroin and blood

Here is one of the basic lessons a screenwriter must learn and live with: Stars will not play weak and they will not play blemished, and you better know that now.

Sure, Brando and Pacino will play mafia chieftans in The Godfather. But those are cute Mafia chieftains. They're only warring on bad Mafia guys and crooked cops; they're only trying to hold the family business together. Try asking a major star to play a real Mafia head, a man who makes a living off whores and child pornography, heroin and blood; sorry folks, those parts go to the character actors or the has-beens. Or actors on the come who haven't achieved star status.

W. Goldman, Adventures in the screen trade (1983), 37

Bad Table manners have broken up more marriages than infidelity

Breaking with convention, I watched Gigi last night. There were some fantastic lines (the script is here). Here my favourites:

Aunt Alicia: Bad Table manners have broken up more marriages than infidelity

Aunt Alicia: [Learning] English? I supose we must. they refuse to learn French

Gigi: She is common
Gaston: Common? How do  you mean common? "Ordinary" common or "coarse" common?
Gigi: Ordinary ... and coarse

Gaston: Uncle! I'll tell you Europe is breeding a generation of vandals and ingrates. Children are coming into the world with ice-covered souls and hatchets in their hands! And before they have finished, they'll smash everything beautiful and decent.
Honore Lachaille: Have a piece of cheese

They don't make them like they used to