System Shock 2
NOTE: This video is NSFW. It is also not for the squeamish. Lotsa gore in here, folks.
The short was created by a UK-based three man group to accompany their Kickstarter for a documentary series about horror video games, but really, it stands pretty well on its own. In three minutes, we get to experience a comprehensive (if System Shock 2-less) history of horror gaming, with brief moments from both indie and triple-A games, retro and modern alike.