Whilst they’re dealing the cards, take out your wallet and keep the 8 of Diamonds hidden, face-down underneath it. Note: It’s important to practice this on your own a few times before doing the trick so you don’t risk fumbling and the card being seen.
When the spectator stops dealing, drop your wallet on top of the cards on the table, thereby adding the 8 of Diamonds to the pile.
You say: “Look inside my wallet” – The spectator finds and reads the note.
You ask: “What does the note say?” – They read it out aloud and as they do so you move the wallet and turn over the top card on the pile – it’s the same card as the one named in your note!