"S**t just got real" moments

[HellbirdIV]

Doom 3, the first time you get jumped by an Imp.

Also, care for something really obscure? Ground Control II, when

Spoiler

your superior turns on you because of the death of his wife at the hands of the Virons - the Virons you've been forced to ally yourself with.

Shit proceeds to become very real by the latter stages of the campaign.

 

[videogamejunkie77]

in bioshock 2 when subject delta shot himself in the head.