The rapper B.o.B. has said that he believes the world is actually flat.
UPDATE: B.o.B. has now released a track supporting his flat earth theory, which samples Neil DeGrasse Tyson.
It includes lines like "use your common sense / Why is NASA part of the department of defense?" and "Indoctrinated in a cult called science / And graduated to a club full of liars / Heliocentrism, you were the sixth victim."