Which countries are at each end?
I find it difficult to believe those people could really be that stupid, so I just assume it's a dull wind-up. Oh look, we got on tv for pretending the world is flat
The 'round earth conspiracy' is one of the oldest and predates all the modern ones. It is amazing to see how popular it's become though. But when you look at the other conspiracy theories, sadly it's not surprising. In the old days conspiracy theory nutters were smelly people with no friends who just used to sit in the corners of pubs rocking backwards and forwards and muttering to themselves. If you went too close to them they'd grab you and say "See the trails that jet plains leave in the sky? That's the government doing that! They spray us with chemicals to stop us from learning the truth!"
Now thanks to the internet these nutters can all join up and reach a kind of critical mass and egg each other on. Some have Youtube channels and websites, and if it's on Youtube then it must be more true than the mainstream media mustn't it? Stands to reason.