User blog comment:Corbierr/Riddle Blog/@comment-4816103-20140912195308/@comment-5328374-20140912201930

You ask "if I asked your twin what door I should go to, where would he point?" because the one who answers honestly would be honest and point to the door to hell.

The one who lies would lie about that too, and.point to the door to hell, so now you know.