What are some internet mysteries that didn't end up just being ARGs?

Honestly, it's pretty refreshing to talk about actual internet weirdness that wasn't just some viral marketing campaign or a bored teenager's elaborate puzzle. I remember spending way too many nights back in the day digging into the Cicada 3301 rabbit hole. Even though people still argue about its origins, it felt way more grounded and cryptic than those scripted ARGs that pop up every other week. The complexity of the puzzles they were dropping was just on another level compared to the usual stuff you see online.

Then there is the whole Cicada thing aside, the disappearance of the Somerton Man, or the Taman Shud case, always creeps me out when it gets brought up in tech circles. People were trying to crack the code in the book for ages, and even with all the modern forensic tools and digital archives we have now, it still feels like we’re barely scratching the surface of what actually happened. It’s not some "game" designed to be solved by a community, which is exactly why it stays so unsettling.

I also find the story of the Wow! signal pretty fascinating. It’s not exactly an "internet mystery" in the traditional sense, but the way it spread through early message boards and forums is legendary. It’s just raw data sitting there, mocking us. Whenever I’m working on some gear or just scrolling through forums late at night, I think about how some things just don't have a neat explanation or a grand reveal at the end. Sometimes a mystery is just a mystery, and that's what makes it actually cool.