All the games i run tend to be Morbid &/or Creepifying, but here are some of my favorites.
One of the PCs was knocked out and taken away, to awake bond in a dark wet sack. The PC used his Strength check to break free and ended up ripping through a random NPC (with an Extreme description and guttural sounds).
"Inky Blackness" is a living portal (kinda like The BLOB, but more of a midnight black in color) that usually leads to a dark twisted mirror version of the world. It chases, grapples (like living intestines) ,and "devours"...
PCs hear a baby crying in the distance then they hear a sickening wet crunch... all is dead silent (that one got a couple of horrified faces)
A pregnant woman gave birth to a fully grown (& old) deformed man with dead eyes and an insane "joker" smile (he ran and jumped out of the 3rd story window at the inn they were at). Who later would only show up in mirrors... sometimes breaking the mirror or sneak up and "kill" a PC (they were fine, but would lose their shadow & reflection for 24 hours).
Mmmm... maybe i do have some issues, but oh well my PCs seem to enjoy it.