Pavitra comments on The Mystery of the Haunted Rationalist - Less Wrong
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Something other than the wall could grant your wish to believe that the wall grants wishes, and then you would believe a falsehood. (Unless the wall grants wishes, too, but ignored yours in particular for some reason. But that's a Gettier case.)
p(wishgranted|~wallgrants) is negligible, I think. Still, I suppose you could just recite the entire Litany of Tarski.
What is p(wish is answered by Murphy the mad god of irony)?