Not many will believe this don't really care. But I've played since vanilla and I've only played a frost mage.
I've 1v2 camped 2 ret paladins that where b/f and g/f they both had shadowmorune (they where **** bad) and i've done other 1v2 / 1v3's and 1v1 duels with no gear on ect ect.
But the best thing I've ever done was back in BC I think s3 I was in a AB and I went to mine's there was 7 alliance. A holy paladin a Disc priest Hunter warrior warlock shaman mage
They where all undergeared, Not to bad but all of them had no resil. (They could of all 7 even been botting for all I know) They where aweful pvpers. And I 1v7ed them. No help whatso ever from any fellow horde, there was nobody around to see it. I didn't fraps it, but I got the biggest boner. I still remember it.
It doesn't make me a amazing player, It was just all the right things at once. (bad players, bad gear, no resil)
They wern't AFK, or half health, or oom. Just legit Full vengeful mage vs 7 undergeared players. The reason I'm so impressed with it was because they had healers.
tl;dr I'm a baddie and want to be good one day.