Some variety of this is in fact the classical reply to Anselm's version of the ontological argument. A contemporary of Anselm's, Gaunilo, published a satirical

Some variety of this is in fact the classical reply to Anselm's version of the ontological argument. A contemporary of Anselm's, Gaunilo, published a satirical proof that a maximally excellent lost island must exist: https://en.wikipedia.org/wiki/Gaunilo_of_Marmoutiers#The_%22Lost_Island%22_refutation https://en.wikipedia.org/wiki/Gaunilo_of_Marmoutiers#The_%22...