On that sort of childish scale, try proving anything.
Try, for example, to prove that the bible exists. I suppose you could give links to references, but how do you know those links aren't artifacts created by Jorge Luis Borges, who probably wrote Iona. You could wave a book at me, but how do you prove that that boon is the bible and not some other book? You could open it at a particular page and say, Lo, here it saith stone thy neighbour, and open another page and say, here it saith many are cold but few are frozen, but how can you prove that all the other pages aren't the Mrs Hill NC telephone directory when you aren't looking at them? By faith saith the believer. But why should anyone have faith in that telephone directory rather than another competing one?