My FF story:
In my really early years of gaming (gradeschool), I was exclusively a PC and Gameboy gamer. My first console was an N64 in late gradeschool. I was pretty much a Nintendo franchise exclusive gamer until middle school. I never had a SNES or PS1. I was a pretty casual gamer.
I got a PS2 sometime through middle school. I mainly got it for Star Wars games that I wanted to play. My first game with the system was Star Wars: Starfighter. One day I randomly got a PS2 demo disc in the mail. I don't know why I got it, but I did. One of the demoes was Final Fantasy X. I had never heard of the Final Fantasy series at this point (I was like 13?). I was never really into JRPGS either (RPGs in general, really). Like I said, I was a casual gamer primarily into Mario, Zelda and Pokemon.
I loved that FFX demo.
People say that RPG demos never ever work. This one worked for me, big time. I probably played it 15 times. It had 2 parts, the first being the opening in Zanarkand until Tidus is "swallowed", the second being Besaid until you jump on the boat for Kilika.
It's hard to explain why it clicked so well. The combination of the music, visuals, story, characters, gameplay...... it just clicked. I had never played anything like it before then.
I bought that game at launch and I remember playing it well into the night, and rushing home from the bus stop to play after school. It is still my favorite Final Fantasy game. I have a file where I maxed out every stat on every character, each with every skill. I have probably played through the full game 7 times or so.
At this point in my life, I subscribed to GamePro and Nintendo Power, started visiting gaming websites, and following gaming as a true hobby. RPGS became my primary genre, leaning towards JRPGS. Soon after beating FFX for the first time (I was like 13/14) I had my dad buy FF7, FF8, and FF9 for me. I played FFVIII first because a friend recommended it.
Since then, I've bought most of high profile JRPGs and WRPGs from PS2/GCN era on. I also, of course, went back to play the some of the classic SNES/PS1 JRPGS that I missed:
FFIV, FFV, FFVI, Tales of Phantasia, Chrono Trigger, Xenogears, Star Ocean's among many others. I've beaten all the main FF games except FF2. I haven't tried the MMO's, though.
I'm still working on playing through the catalog of classic JRPGs that I missed. I recently played through Valkyrie Profile 1, Valkyrie Profile 2, and I just started VPDS. Some JRPGS that I haven't played yet that I want to are Odin Sphere, the Shadow Hearts series, and the Ys series.
Basically, in short, thanks to a random demo disc, I have found my favorite genre and my favorite hobby. My mindset about gaming would be completely different if that demo disc didn't happen to fall into my hand. Thank you, Final Fantasy X.