Phasmophobia is a cooperative horror game in which players investigate haunted locations and collect evidence to identify the ghost, and the ghost writing book is one of its classic evidence tools. When a ghost interacts with the book, it leaves writing behind, and that moment has become a familiar beat in gameplay videos, streams and horror edits shared online. The sound is still used because it needs no explanation for fans of the game, instantly signalling that evidence has been found and that the hunt has just become more dangerous.