The Triplicate Stone: Why Not Superman Returns?

Jon picked up the Superman III DVD. "Hmm. That's not what I wished for." He momentarily wondered why, if it had be a third movie, the stone didn't give him Superman Returns instead. Jon had nothing against Richard Pryor, but the original third movie kind of sucked in comparison to the new third movie. Third movie. Suddenly, it hit Jon. For some reason, the stone was granting things in threes. His height increase was three times what he wanted, his muscles were three times what he wanted, his penis erection length was three times what he wanted, and now this Superman movie was three times what he wanted (in a way). But why was the stone doing this?