Well I have to say my favorite game moments are-
When I beat Cubia on .Hack//Mutation,I was stuck forever on that part and I just about gave up on it when My strongest Team mate and I died,but my third partner revived me and we finished Cubia off.
And my other one was while playing Halo 2,Just driving off the cliff with a Worthog and jumping out before it hits the ground leaving your friends that are in the Worthog to die alone.XD
What are yours?