1. Frirst griffon ride in WoW.
2. First visit to the forest floor in Kelethin, in EQ.
3. Break in to Plane of Hate, in EQ.
4. First few hours in SWG. I'm in Star Wars!
5. Killing zombies in that creepy starter town, in Maine I think, in Secret World.
I have many more, but those stand out.
EQ1, EQ2, SWG, SWTOR, GW, GW2 CoH, CoV, FFXI, WoW, CO, War,TSW and a slew of free trials and beta tests