System Shock 2
Realizing that you've been talking to Shodan the whole time when you finally reach your contact.
Fade to black
Being chased by the "super" morph and later realizing that he has been among the rebels the whole time.
Myst IV
Walking around in Spire, following in the footsteps of the previously trapped son of Atrus. That's atmosphere!
Knights of the old republic
Finding out who Revan really was. I really didn't see that one coming.
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