I recently subscribed to a Gmod person on YouTube named DasBoSchitt. It appears that he recently posted a late Halloween video that, in my opinion, contains excellent horror as well as humor. What made me think of you guys is that it contains a large chunk of the Penumbra soundtrack, the use of a recreation of the Infested Corridors area, and also the horror.
What stands out, though, is that the first person scene makes me feel like I'm the person, with all the fancy head bob. I wonder if such dynamic controls could be put into a Frictional Game. It would, in my opinion, increase the immersion greatly. There's a dumb screamer though that didn't scare me.
http://www.wegame.com/watch/treat-or-else/