—Athoughtexperimentinvolvingagamebetweentwoplayers, oneofwhompurportstobeabletopredictthefuture. Thefirstplayerhastotrytomaximizewinningsbychoosingoneoftwoboxesofmoney; however, theamountwonalsodependsonwhetherapredictionmadeaboutthechoicebytheotherplayerprovestobetrue.