Unlike modern viral content, which spreads via algorithms and shares, Sisters.wmv spread via physical media and email forwards. Here is why it became a legend:

In 2006, sibling rivalry content was the "drama bait" of its day. Sisters.wmv tapped into the universal fear of estrangement, packaged in a blurry JPEG of two girls standing in front of a mall fountain. It was ambiguous enough to be anyone's story.

If you wish to experience this digital relic, search for “GwenMedia - Sisters.wmv” on the Internet Archive (archive.org) or specific "lost media" YouTube re-upload channels. Be warned: Do not expect high production value. Expect motion blur, jarring transitions, and a song that sounds like it was recorded in an aquarium.