Interestingly, it should perhaps be noted that the arguments for ghosts presented in this thread are of a similar caliber to the arguments presented for Round Earth in other threads.
In this thread we have pictures of ghosts, the argument that people claim to have seen ghosts, and an attempt at providing a possible theory of physics which might allow ghosts to exist.
In FED&D and FEQ&C we have pictures of a Round Earth, the argument that people claim to have been to space and seen the Earth's roundness, and attempts at providing possible theories of physics which might allow the Earth to be round.
Yet I don't imagine for a moment. that 99% of the world population believe in ghosts.