John Cazale

Fredo Corleone: "I'm your older brother, Mike, and I was stepped over!"
Michael Corleone: "That's the way Pop wanted it."
Fredo Corleone: "It ain't the way I wanted it! I can handle things! I'm smart! Not like everybody says... like dumb... I'm smart and I want respect!"

Fredo Corleone: "How do you say 'banana daiquiri'"?
Michael Corleone: "Banana daiquiri."

Michael Corleone: "I've always taken care of you, Fredo."
Fredo Corleone: "Taken care of me? You're my kid brother and you take care of me? Did you ever think about that? Hah? Did you ever once think about that?"

"Every time I put my line in the water I said a Hail Mary, and every time I said a Hail Mary I caught a fish."