I can't believe this is really a point of debate in this day and age, but it is.
This guy wants to launch himself into the sky in a homemade rocket to somehow prove that the Earth is flat:
Flat Earth Researcher Told He Can't Blast Himself Into The Sky at 500 MPH
There was even a whole convention about this recently:
A Fascinating Look Inside the First Flat Earth International Conference in Raleigh, North Carolina