An easy, impossible piece of magic!
A black wallet is placed on the table, containing two predictions. A deck of cards is mixed, and two random cards are selected. The spectator is then given two brass chips, one showing a circle and one showing a square. They place each chip onto one of the selections. When the predictions are removed from the wallet, not only do they match the selections, but a circle and a square have been cut out of the predictions, matching where the spectator put the brass chips! Easy to do and always works!