The first time I reached the level cap was on my hunter. I was questing in Kirin'Var village in Netherstorm. I dinged 70, set off some fireworks, jumped around a little bit and yelled "woo hoo!" to the whole zone. I was a bit excited, as I could finally get working on this end-game thing people were talking about.
Well, that's my story. So where were you the first time you reached the cap?