Part of The American Film Institute (AFI 100 Years... series), AFI's 100 Years... 100 Movie Quotes is a list of the top 100 movie quotations in American cinema. The American Film Institute revealed the list on June 21, 2005, in a three-hour television program on CBS. The program was hosted by actor Pierce Brosnan and had commentary from many Hollywood actors and filmmakers. A jury consisting of 1,500 film artists, critics, and historians selected "Frankly, my dear, I don't give a damn," spoken by Clark Gable as Rhett Butler in the 1939 American Civil War epic Gone with the Wind as the most memorable American movie quotation of all time.

Marlon Brando is in second and third place with the following movie quotes:

'The Godfather' where Vito Corleone says "I'm gonna make him an offer he can't refuse."

'On the Waterfront ' Terry Malloy says "You don't understand! I coulda had class. I coulda been a contender. I could've been somebody, instead of a bum, which is what I am."

More Info: en.wikipedia.org