Everything happens in their hands and in their minds!
Two effects straight from Chris Ramsay's personal working repertoire, this is something he's been using to book himself countless corporate/private events. An interactive routine which guarantees a personal connection with your audience.
Two decks are presented to two spectators. One open pack of blue cards and one sealed deck of red ones. The sealed deck is placed within one of the spectators hands, the other spectator selects a card from the open pack, moments later the selected card has now vanished from the open pack and impossibly appears inside the cellophane of the sealed deck!
Imagine showing a spectator a sealed deck of cards, placing it between their hands and having them think of a playing card. Now imagine that the card they just thought of is now impossibly trapped and sealed inside the cellophane which has never left their hands! The best part is, everything is fully examinable and they can decide to tear it open to find out how it was done, or keep it sealed as an impossible souvenir!