There was a ttrpg where the setting was an old haunted mansion. The players' characters entered the mansion cautiously. As they explored, strange things started to happen. Doors would close on their own, cold drafts would pass through them, and they heard eerie whispers. Then, one by one, their characters started to disappear. The players were on edge throughout the whole session, trying to figure out what was causing all these horrors.
One horror story is about a group playing a post - apocalyptic ttrpg. The game master was really into creating a spooky atmosphere. He described a derelict hospital filled with mutant creatures. One player's character got separated from the group and was chased by a grotesque mutant. The player was so immersed that they actually screamed in real life.