The story usually follows a familiar "lost media" or "deep web" trope:

This specific story is a great example of . It plays on the "uncanny valley" effect—taking something universally seen as innocent (kittens) and associating it with something hidden and or dangerous.

: A user finds a file titled Kittens 13.mp4 on an old hard drive, a shady forum, or a file-sharing site.

: Instead of kittens, the video reportedly contains surreal, high-pitched audio and grainy footage that supposedly causes psychological distress or physical illness in those who watch it.

The phrase is a notorious internet creepypasta and "lost media" legend. While it sounds like a cute animal video, it is actually a fictional horror story about a supposedly cursed or disturbing file. Summary of the Legend