Winning various video game competitions, which my best friend also competed in, and we fought each other in the final to which I just won.
Final Fantasy 7 - Whole thing really
Castlevania SOTN - entire thing
Counter strike CZ (when I used to be pretty good) me and a friend I know real life almost killing an entire opposing team, (these guys were awesome players) he died, I almost took the last 4 out but after awping 3 of em the last one got me on the reload

(I can't even aim now in the game I haven't played in so long!)
WoW - First moment I went in to Karazhan (since stopped playing it)
First playing on my spectrum back in the day, literally jumping back and forth between games.
Playing Revenge of Shinobi / Golden Axe / Streets of Rage on my Mega CD on the Mega games 5 pack, and just thinking how awesome it was.
I am sure there are tons of others, I will think and write some more down later
