"He was bangin' cocktail waitresses two at a time." That line cracks me up.

Also, when Willie goes, "yeah, buffas" in the Senate hearings. Great stuff.

There is all sorts of subtle humor, such as in I, when Michael explains to Kay how "Luca Brasi held a gun to his head and my father calmly explained that either his brains or his signature would appear on that piece of paper." The look Kay gives him back is priceless.

I love Clemenza dancing at the wedding like some kind of drunken Michael Flatley, and then guzzling down the entire bowl of wine.

Sandra Corleone impressing her friends by describing the size of Sonny's prodigious organ.