I've been out of Horror for about a year now and was just remembering some good times horrifying players and their characters alike.
Then I got to wondering what some of the favorite tricks, traps, monsters, etc, the other people here who conjure nightmares for funzies have frequent their campaigns.
Fire when ready.
This article more for video games than tabletop games, but I would think some of the concepts would cross over. Particularly the commentary on perceived threat giving rise to the fear of death.
Nice, I'm a big Escapist fan. (Mainly for Zero Punctuation.)