Gotta add:
Tanking and downing the Headless Horseman a month back.... at lvl 65 with green gear! Boy did I get crit like every hit! Got everything but the mount
spending 1100g to get gear that makes me T4 or T5 equivalent, even though I've never raided or had any cool epics (aside from HH helm and blade, see above).
Doing AZN, Old Kingdom, and Gundrak Saturday was fun. I was over-level for the first 2, but pretty sure I did Gundrak at -3 (either way, I was 75 and saw mobs at 77-78).
My IRL friends and I created a new guild for us, and downing Keri in Nexus was our first guild dungeon clear. Got the achievement and guild posing screenshots. First time I've done that with a guild (celebrating the accomplishment, that is).
About 15 months ago, I had a group of IRL friends (and one new friend who we met in game) who would play every night at the same time. That was my first time in a real social guild, and playing drinking games (shot/drink every time someone breaks sheep led to some intentional breaks, methinks) and running dungeons from 20 to 45 drunk as a group on vent was the best time I had on WoW.