I think this has been mentioned before, but I always laugh at the little hop Fredo does when he enters the room in Vegas where the band, Johnny and the babes are waiting to party with Michael.

"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"

"I stood in the courtroom like a fool."

"I am Constanza: Lord of the idiots."