Spectator selects a card, then he gives you a card, and the he decides whether he wants to keep the last card or take the card he gave you.
When he's finished making all of his decisions, the Prediction Card is read...
It reads: I will have the Coke, You will have the Pepsi. In the bag will be the Mountain Dew.
As a bonus YOU can then reach into the bag and pull out the Mountain Dew.