FF1 Definetly when you get the class upgrade and think holy shit I'm pimped!
FF2 Actually beating the game because it's so crappy.
FF3 I liked the portion of the game where Desh joined you as a guest.
FF4 I liked the entire betrayal of Kain and the battles it caused. Also when Cecil has to fight the darkness inside him to become a Paladin.
FF5 Thinking to myself, Why is my main character called Butz...
FF6 Kefka's laugh, when the world became undone, the valiant rescue by Shadow on the floating continent with a massive F U to Kefka, all of the little quirks in the conversation like when Sabin jumps off the raftor when Relm brings Strago to his senses, Uncle Ulty and when you defeat Kefka and everyone is on the Airship and Terra doesn't disappear and let's her hair flow in the wind.
FF7 The bike scene when you escape from Midgar. That CS was probably the most influencial marketing campaign ever. We all thought holy fucking shit, I NEED this game just for that.
FF8 Seifer and Squall going at it in Training, thinking wow this is cool, then they get lectured in school and it somehow becomes less cool. The SEED exam was sort of cool, so was the fight with Diabolos.
FF9 The ending was all I liked really, I only played it front start to finish because it was a FF, sort of like FF2.
FF10 Nothing was really all that WHOA. Tidua getting with Yuna was really the climax of the game I think.
FF11 Meeting so many interesting people, being screwed over by the same people on occasion, people thinking they're so hot. Seeing the racism that exists on both sides. It was also interesting to see how vicious some people could get.
FF12 Everything Balthier said. He's my new fav character in the series. He owns all the other characters and only lacks in the fact that his character wasn't as developed assome of the other characters in the series.
FF10-2 Paine turning out to be a totally uninteresting character which was a big disappointment and so turned me off to the game.