Very earliest have to be back in Vanilla, where i created my very 1st toon, an Troll shaman.
Ran around clicking the Guards "Lok'tar friend, what is it ure wish", "lok'tar Ogar*, "Blood and Thunder* etc etc.
It gave me the epic feeling of a whole world, with warcraft <3
The music, the sound when running, hitting, shooting LBs and stuff. It was EPIC!