Most quotable movie ever?
Well, not quite, but I'd count Josey Wales 3rd for having the best movie quotes of all time.
1st has to be "The Godfather", since many quotes from this movie have become mantras.
2nd? "Casablanca". A rare movie with a perfect script.
3rd is Josey. Although it doesn't quite have the "exalted classic" status as many other movies, and other movies may have quotes which have become more widely known, or have more poignant quotes at a dramatic moment, the sheer volume of great quotes in TOJW is simply astounding.
Honorable mentions:
"Some Like it Hot" - although not nearly as quotable, it's another rare movie with a perfect script.
"Jerry Maguire" - 3 awesome quotes: "Show me the money!", "You complete me", "You had me at hello".
What are your favorite quotable movies?