scarface (1983) and dog day afternoon (1975) are my top two!!! and godfather i and ii are required viewing after that... its very cool watching them and being like ohhh THATS the scene thats been referenced a million times in pop culture. skip part iii though its absolute garbage trash and not even in a funny way its just takes a big dump on michael corleones characterization from the first two movies AND its boring and full of weird incest

other than that... you also need to watch scent of a woman (1992), and justice for all (1979). because then youll get all the references made in pacinos greatest performance of all time: youtube.com/watch?v=Wu8q3fcKNMk&themeRefresh=1