Effect :

You give a spectator a packet of cards and ask him to shuffle them. Next you bring out two predictions. Two spectators each select a card. The packet is in their hands as they make their selections.
The two selections match the predictions ! What would have happened if they had chosen other cards ? The answer is nothing ! Because that's exactly what is found on all the other cards... NOTHING ! Every card is completely BLANK !

Everything can be left for examination
Easy to do
Complete with cards & predictions.