Definitely The Godfather. One weekend when I was 16, my mother and brother had gone to a soccer tournament, so I was home with my dad, and he said, "Why don't we go rent a movie?" One of my closest friends is really into the Mafia, and was always telling me how wonderful The Godfather is. So I told my dad, "well, I've never seen the Godfather." His response was "Really?!?!" So we rented GFI and GFII, and about a week later, GFIII. I was completely hooked. So I went to the library and started checking out books on the Mafia, and one day when I was bored, I ended up here. And it continues to feed my obsession!