In one scenario I've written for Warhammer Fantasy Roleplay, the party have to walk into an abandoned temple of Sigmar
in a town that's been subject to ghostly abductions.
As soon as they enter, the smell of death and decay is thick in the air. They hear the sound of dripping, a few of them even getting a little wet. Looking up, they see the source — hung by hooked chains are dozens of human corpses. The temple floor is slippery and treacherous with their blood. Some are swaying.
The instant any two characters begin to speak, the corpses react to hearing a human voice. They weep, as best they can, with decayed mouths and eyes.
Some time later, after various trials and obstacles, the party come across a nearby castle. Entering, they see a man stumbling in the night shadows, leaning against a wall to remain upright. As the characters get closer, they catch a familiar, bloody scent. The man attacks them, and the party beat him down. He's a decayed corpse, like the rest. But he won't die. Whenever the party beat him, he just weeps. And if they try to leave, he gets up and attacks again, with increasing desperation.
During the final encounter, the man behind it all has a spear that pierces the torso and forces the blade outwards, opening the rib cage and spilling the human contents onto the ground. It is not instantly lethal. The room in which this takes place is entirely enclosed, but the walls and ceiling are covered in blades, which this man pierces himself with in order to crawl up.
Although I see how this could be serious Narm