Hmmm.. I thought everybody only knows Stalker, where there is no golden ball...
But aside for the "nothing" thing, this would be a great opportunity for a couple of easter eggs, notably for wishing "HAPPINESS FOR EVERYBODY, FREE, AND NO ONE WILL GO AWAY UNSATISFIED!"
I wonder how the game should react if you wished for "full win"... maybe that could be justified if it was hidden as well as the secret of the dragonslayer and berserker armour, possibly in a hidden special level called the mean grinder. I think we would have to draw the line at wishing for specific badges/medals, though =)