mine probably doesn't sound very exciting to most, but for me it was when i first got to shattrath city. i started playing just around the time TBC was released, knew virtually nothing about the game at all (still don't lol) and only really started playing because a friend introduced me.
but once i'd started to get into the game a little i found out about shattrath and made it my goal to get there, choose a side (aldor/scryer) and then crack on to 70. for somebody like me who doesn't really play games much (except for this and angrybirds hehe) it was a great moment, and one i still remember now.
so for all the other jolly and upbeat people who remain, what are your fondest memories of your time playing wow? :)