I want to add a couple of good ones I’ve found:
Jeff the Killer lost media: no one knows where the original Jeff The Killer image came from.
Mortis.com: old weird website
Also here’s a good website on various obscure computer/Internet related oddities: https://suricrasia.online/iceberg/
There’s what I call the “Rumpelstiltskin phenomenon.” Or, more appropriately, the “Rumpelstiltskin pervert phenomenon.” More a phenomenon than a mystery.
It’s when a picture of a girl is posted online and a perverted guy asks what her name is. As if knowing her name gives him power over the girl to summon her and convince her to have sex with him.
It’s so you can look up the person’s name to see if they have more content available somewhere.
As an alternative reply, if you were trying to make a joke, that wasn’t a clever one.