Bioshock: Discovering who Atlas really is. UNEXPECTEDTWISTIEZOMGGGGG.
Fable: (FINALLY) getting to kill Teresa.
Halo 3: When the halo ring explodes.
And when Sgt. Johnson dies. Sob. ;.;
Pokemon Emerald: My first completed pokemon game. I beat the elite four on my first try. I felt so complete. xD
Stranger's wrath: Finding out Stranger's 'little secret'. Oh, come on, you knew it was coming. xD