The flat earth thing is a joke, no? I mean it's gotten pretty elaborate, but it seems as though they're always dropping sarcastic hints here and there...
No, unfortunately it is not a joke. There are people sincerely believing that the earth is flat (some also believe it is hollow and we live inside it) and actively trying to convince others to believe the same. Search for "flat earth" on YouTube and you will see hundreds of videos by many different authors, sometimes with tens of thousands of views. They try to come up with arguments for pretty much any proof you will toss at them, like saying that things disappearing over the horizon are due to perspective or "light bending".
Hmm, I always thought the elaborate and ridiculous explanations were merely an embellishment of the joke. Kind of like the Church of the FSM. That's a lot of mental gymnastics, it's easier to believe the world is round and whatnot.
