0hbbw5sfm8p69t771w868_source.mp4

When you download or inspect a video from a Reddit post, the source file is often given a long string of characters like this.

Look for the page you were visiting right before or at the time you saw this filename. 0hbbw5sfm8p69t771w868_source.mp4

Because these IDs are temporary or specific to a site's internal database, the "story" depends on where you encountered the link. However, this specific naming convention is most commonly associated with: When you download or inspect a video from