playing Dark Forces 2: Jedi Knight and the point where your actions in the game determine if you go to the dark side or the light. no cookie cutter choices like in the sequels, just the game keeping track if you were a nice guy or a dick. no other game has gotten that good/evil path down as well
the Mass Effect 2 intro, stepping onto the bridge of a half blown up ship and staring out into space. such an awesome way to start the game
the first encounter with a Cyberdemon in DOOM. that was almost a #### your pants moment
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