The joke in the meme is John Cena laughing at JKR being in the Epstein files, though. That’s not a joke, it’s disinformation.
If the text said something about it being rumored, that would feel more like a joke. That would be sweet karma. But it’s not cool when they post disinformation, and it’s not cool when we do it either.
While it’s non-defensible; a lot of people just believe what they see in memes. A family member of mine is like that.
Not sure if this is sarcasm, but I’ll answer just in case!
It’s referring to 1999. The Y2K scare.