en.wikipedia.org
Way back in the prehistoric era of this forum (2003), people joked a lot about the ridiculous claims that Nibiru, a/k/a Planet X, was going to destroy the Earth. My memory may be incomplete or inaccurate, but the way I remember it,
I started joking that I was the King of Planet X, and then I started adding a humorous Planet X option to the end of my polls. It caught on, others started doing it, and it became almost a requirement. Before you joined, this place was a lot nuttier, there were quite a few crackpots here who believed in Nibiru and other crazy ◊◊◊◊.