Should the burden of proof be on the side of a person who believes in the external world? Should believers in the external world have to prove that there really is an external world independent of our minds? After all "The external world exists" is a positive existence claim, in just the way that "God exists" is a positive existence claim. So, if theists have the burden of proof, do external worldists have the same burden? Do we have the right to believe in the external world if the we can't refute the claim that we are brains in vats who are being given the experience of a world that really does not exist?