The scene in Havana where Fredo is introducing everyone is pretty funny...him going on with all these judges and politicians, telling Mike that one of them does a "mean cha cha cha" and then announcing to the table that they should try "some of them local drinks," like a Cuba Libre. At that point Sen Geary, who we (and the Corleones) know secretly frequented a house of ill repute brashly says "I want one of those red headed Cubanas," Which Fredo says , "That you've got con gusto."

BTW how is it that Fredo, who did not know the term for banana daiquiri was the same in English and in Spanish know about Cuba Libres and was able to say "con gusto?"