C&C: Seths last and Kanes first appearance
HL1: Tram ride
HL1: Arrival of the soldiers
HL1: Holding the portal room while it charges
System Shock 2: Arriving at Dr Pollitos office
System Shock 2: Being hunted down by The Many in the Von Brauns Cargo Bay
MOH:AA: Landing on Omaha Beach
CoD: Taking Stalingrad
CoD: Taking the Reichstag
CoD:UO: Manning the guns on the bomber
GTA:VC: Driving down the road opposite the beach on a rainy night with Phil Collins on the radio
HL2: Driving to Nova Prospekt
HL2: Enhanced mavity gun
HL2:Ep2: Defending the tunnels against the ant-lions
HL2:Ep2: Taking on the Strider attacks
Doom3: When everything goes to poo at the beginning
CoD:4: The opening cut scene and the mission before the nuke
CoD:4: Pripyatt
CoD:4: Defending on the bridge in the final mission
CoD:MW2: Taking the oil rig
CoD:MW2: Assaulting the Gulag
CoD:MW2: Defending Washington in the Helicopter
CoD:MW2: Cpt. Prices contingency plan
CoD:MW2: Final mission
Mass Effect: Flying to a planet, walking to the airlock and seamlessly leaving the ship
Mass Effect 2: Flying through the Omega Relay and the final mission
Fallout 3: Stepping out in to the Wasteland for the first time
Fallout 3: Walking around the Washington monument with the ghostly music
BioShock: Arriving at Rapture
BioShock: Arriving at the residential district with a derailed Tram and this music kicks in -
GTA:4: Standing on the roof terrace of (ex)Playboy-X's apartment watching the sun set and day turning to night, also watching a thunderstorm come in and pass over.
GTA:4: Four Leaf Clover