Wow, cool thread!
I guess the one moment that stands out is when I made it to Stranglethorn Vale with my first WoW character and got a taste of PvP in that game for the first time. It was a one on one fight and I remember being so nervous I was jumping out of the chair and my fingers were all over the keyboard! I got spanked pretty bad needless to say. I had the same feeling for the first 50 or so one on one fights in WoW.
I can't describe the sensation in words but it was amazing. Oh how I long for those days again.
--jaded