No Sleight card to Envelope - Martini's Magic

The magician removes an envelope from his pocketand opens it to show a card inside. The flap is closed and the envelope is placed aside.

A card is selected (No force) and signed and lost in to the deck. You then explain that you will find the cards and you turn the cardfacing you as you spread it, this will get a laugh sicne t is a signed card. You remove a card and place it face down onto the table and that it will match the prediction that is face down in the envelope. When the card is turned over it is NOT thier card. The envelope is opened and the card removed and it is THE SIGNED CARD!!!. The Card, deck and envelope can be examined.