For me, it all started about 8 or 9 years ago, with a friend that had brought a strange game to a swim meet (yes, I was on the swim team for a large portion of my life - 9-18, IIRC). He handed us a set of characters (my brother, me, and one of my other friends), and we ran through a dungeon that he had made himself. We get home, and talk to my dad about this great new game that we had had so much fun with during a swim meet, and it turned out that he had played through college! We dug up some of his old stuff, gathered up our friends (mine only included the ones at the swim meet, my brother's was quite a bit larger), and started playing once or twice a month. The guy that introduced us didn't last long (having his toes turned into flowers because of his stupidity at one point), and a couple friends didn't last either (one of whom tried to attack a city guard, rolled two nat 1s in a row, fell down and broke his wrist), but for the most part, the group stayed steady up until about 3 years ago. It finally broke up early last year, due to a horrendous session (the worst I've ever seen), but for the past three years, I've had a college group to keep me going.
Now that I'm graduating, though, I'll need to find a new group to keep me going, wherever I end up (which, at this point, is far from certain), and that's my story.
For my most memorable story, I'd have to say that it's one of the early ones, back when the group was 'only' six people (GM included). Someone blew over a bottle, and everyone was so tired that they couldn't stop laughing. We decided to stop after 5-6 attempts at bringing things back in line and failing miserably (three times because the bottle was blown over again).
Magius out.