For me, it was the first time I set foot into Stormwind as a human paladin. I remember mirin' a max lvl on a Dreadsteed and thinking that's the coolest mount ever. I asked my friend if Warlock's can own one of those because I wanted to re-roll to have a demon pet. He told me it was a warlock exclusive mount. Instantly deleted my lvl 6 Paladin, and created a Warlock.