I know. It feels cruel at the time, especially when they're so adorably fuzzy but 'off' any scene that doesn't propel the story forward or reveal something about character. Such heartlessness separates great screenwriting from a lot of pure 'meh'. And while you're at it, why not cloak your character with immortality by writing a moment around one unforgettable, revelatory line?
1. THE AFRICAN QUEEN
Charlie Allnut: A man takes a drop too much once in a while. It's human nature.
Rose Sayer: Nature, Mr. Allnut, is what we're put in this world to rise above.
2. SUNSET BOULEVARD
Joe Gillis: You're Norma Desmond. You used to be in pictures. You used to be big.
Norma Desmond : I am big. It's the pictures that got small.
Captain Renault: See that Major Strausser gets a good table. Something near the ladies.
Carl: I've already given him the best, knowing he's German and would take it anyway.
4. BOTTLE ROCKET
Anthony: Then why aren't you over there working for him right now?
Dignan: Because we're fugitives...and also because he fired me.