My stepfather has lost his shit and gone from accountant to flat earther. This has evolved from glass dome above the earth that caused the Challenger explosion to some new shit. Enter the ２０４０ Ｐｈｏｅｎｉｘ Ｅｖｅｎｔ. Every 140 years there's a cataclysmic event which changes the fundamental nature of the planet. This cycle is so powerful that it actually destroyed the Mayan civilisation. In 2040 it's due to happen again and the ONLY place on earth that will be safe is Egypt.
But what was the last thing that happened in 1900, you might ask.
The 1908 Tunguska Event in which an asteroid air burst above Siberia and killed a few reindeer herders.
But 1908 is 8 years after the 140 year cycle and 1900 was pretty uneventful, you might say.
If nothing else flat earth shows how completely pointless it is to argue with conspiracy theorists.
You can fairly easily do tests yourself that prove the earth isn't flat, under the right conditions you can even see it with your own eyes. You don't have to take anyone else's word for it, or need any sort of specialized knowledge or understanding, and somehow they still claim it's a lie.
He could launch a sturdy balloon with a gopro and a gps to disprove thousands of wasted hours in an afternoon. It's such a lazy conspiracy theory. Absolute teletubbies shit.
Or he could build a homemade rocket lol