On sites like 4chan, servers automatically rename uploaded files to the exact millisecond they were received. This creates a permanent, searchable "birth certificate" for the content. Why is it Infamous?

A snippet of a song or video that people are desperately trying to find the source of. The Digital Archeology

Eerie, empty footage of malls or hallways meant to evoke a feeling of "weirdness."

Because these files are often deleted when threads expire, "1640301752098.webm" has become a bit of an . People post the filename as a "challenge" to see who can find the original clip or to trick new users into clicking a potentially unsettling link.