Zex-421.mp4

: In the most extreme versions of the creepypasta, the original uploader and several commenters "vanished," leaving behind only corrupted hard drives containing a single, unplayable file. Reality Check

The video is described as being 4 minutes and 21 seconds long (matching the "421" in the title). Descriptions of the footage vary, but common elements include: zex-421.mp4

: Viewers report a persistent feeling of being watched and a specific auditory hallucination—the same low-frequency hum from the video—whenever they are in total silence. : In the most extreme versions of the