Although I've spent a somewhat ludicrous amount of time playing various MMOs (EQ2 mostly) I cant really recall anything particularly dramatic that happened to me personally, just the unusual drama like a "friend" of mine who was "dating" a girl he met in-game, only for me to then meet her actual boyfriend in the game a couple weeks later. Or the time I helped steal back a guild that was itself stolen and being cursed out and threatened in public chat for weeks. They're not really "stories" just "stuff that happened"
However, I do know of a couple infamous EQ1 stories (someone linked to some cracked articles that also mentions them, but here are direct alternative links). These are not my own stories, I was not there and I take no credit for them, but there was the time that…
...Almost 200 players got together to murder a mob that the developers never intended to be killed.
And also that time when...
...a level 5 bard decided to troll absolutely everyone on a "no rules" server so hard that they had to invent rules for it