I'd been raised in a D&D is EEEEEVIL household, so I was predisposed against it from the very start. But then one day when I was 11 or so, my mom was going to some seminar of some sort at the library and I tagged along... some other kids were playing a simple dungeon crawl in the hallway, although since it was so long ago and I understood so little at the time, I don't know whether it was 1e or 2e. They invited me to join, and I got to play a wizard.
Ah... I remember that first combat well. I cast sleep on the goblins, got five of them in the spell, and spent the next three turns or so going around and slitting their throats while the warriors were dueling the other goblins that were advancing from another corridor.
I went home and instantly tried to remember as many rules as I could... which were basically none, since I had more or less each turn asked for a list of things I could do from the other players and picked one. So I came up with some rules and some monsters and some spells and weapons and things, and even drew a dungeon together. No attack rolls... it was more Final Fantasy like. Massive HPs, keep whittling them down as we exchange blows. Better weapons simply meant rolling more dice... oh yeah, only had d6s. Made do anyway.
At any rate, I was hooked to the concept. Got some of my friends together and I DM'd my first game. To my memory, it was a darn cool dungeon too... one I should probably recreate with 3e rules. The players started in an underground town and were trying to excape to the surface. It was a miniature maze with treasure hidden in all kinds of secret places (finding a secret in my little homebrew rule system involved saying "I look THERE" and pointing on the map) and puzzles requiring one to find keys to unlock doors, pull levels, and obviously fight monsters.
There were five dungeons, five levels, each with a nasty boss at the end, and in order to get out they had to find the Sword of Light to cut through a barrier of pure darkness. The Sword of Light was the most powerful thing they'd found so far, and I think either rolled 5 or 6 d6 for damage. It was impressive.
At any rate, after a month or so playing with 100% entirely made up home rules, we actually went to the store and picked up the D&D Basic Game... 2e, IIRC. And also the 2e DMG (no PHB or MM). We noticed instantly that the rules were hard to follow, so we ended up making up most of the rules again, which was fine by us. But now we had rolls to hit, ability checks, a tiny handful of spells, and a small assortment of monsters. (The basic game didn't have much, though it DID come with dice, which rocked). So we made up monsters, made up spells (gads of spells, most of them broken since we made them get more powerful with more levels, and put no dice cap on them. Sometimes the spells increased exponentially in power, and at one point I remember us having to write a TI-83 program to roll 600 dice for damage... but since the monsters I was throwing at them had 3000+ HP, it didn't matter too much).
When 3e came out, we were VERY skeptical about it... mostly because all those hard to understand rules in 2e were suddenly easy to understand, and thus we couldn't just make stuff up anymore. But it grew on us.... and here were are now. A little more than a decade later. I finally was able to work up the courage to tell my mom I was playing -that- game, and even managed to convince her it wasn't inherantly evil.
I have no plans on stopping playing this game.