Using the AT-ST in Jedi Knight II
Beating Zelda: A Link to the Past without saving and without losing a life
Beating the first Metal Gear on the NES without any maps/help (took over a year playing off and on).
Playing Mario 64 for the first time
Playing Ye Ar Kung-Fu on the Gameboy Advance (where's Time Pilot '84? Fuck the original).
Getting about 4 hours into the PC version of Deus Ex and realizing how awesome and original it was (forgetting the shitty enemy AI).
XCOM and SYNDICATE WARS
The first time I came across the T Rex in the first Tomb Raider (classic moment)
Seeing the intro movie for Resident Evil: Codename Veronica for the first time on the Dreamcast
Beating CastleVania Symphony of the Night on the PSX in short order, only to realize you have to play the game again with the levels UPSIDEDOWN
FINALLY getting my hands on Fire Pro Wrestling D import for the Dreamcast and realizing it is the BEST wrestling game along side of Wrestlemania 2000 and WCW/NWO Revenge
Beating Golgo 13 for the first time on the NES
Finding an original BERZERK arcade machine less then 2 miles from my home (My all-time
favorite game).
Finding out Samus was a female in the original Metroid for the NES
Realizing there was an arcade version of Ninja Gaiden after owning the first NES version for a year. Finding out that said arcade version DESTROYED.
MAME
FINALLY FINALLY FINALLY beating System Shock 1+2, two of the hardest but best games I have ever played.
Global Operations multi-player
Gitaroo Man for the PS2 (Trust me music fans)
Free falling out of an airplane in No One Lives Forever
Fallout 1+2
Serious Sam 1+2
Tron Deadly Discs and Mission X for the Intellivision
Discs of Tron arcade game (2nd all time favorite)
The entire Medal of Honor series
XENOGEARS
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Oh yeah, forgot Planescape: Torment, the game fucking rules also, GREAT story