When in Godfather III Al Pacino says the famous quote "Just when I thought I was out, they pull me back in!" because when he says "pull me back in" the gesture he makes with his hands always cracks me up when I'm watching it with my friends.

Also in Godfather III when the heads of Mafia families are getting gunned down by the helicopter, and one don says "my lucky coat!" before he is shot. I don't know what either Mario or Francis were thinking when they wrote that...
that even old don's have things like "lucky coats" that they would save if they were being shot at? That they're people too? It was kind of sad to see him die trying to save his lucky coat. I felt sorry for the guy. Mario and Francis did their job.