Do As I Do

Lesson overview

Materials

Substitutes: You need two complete decks, ideally with different coloured backs so nobody suspects a swap. Two mismatched decks from a games cupboard are perfect — they do not need to be new or identical brands, only complete.

Before you begin

1. 1

   Find two complete decks

   Check both are full. A missing card in the spectator's deck means there is no matching card to find and the ending collapses.

2. 2

   Use different back colours

   Contrasting backs prove the decks are genuinely separate and let you keep track of which is which during the swaps.

3. 3

   Rehearse the sequence out loud

   Say the six steps in order — shuffle, swap, choose, bury, cut, swap back — until you can lead someone through them without notes.

Environment: Sit directly opposite your spectator with clear table space in front of each of you. Both decks must stay visible the whole time so the swaps are obviously fair. A mirror — or your phone camera propped up — shows you exactly what your audience will see.

Performance script

A sample script to adapt — make it your own, and never rush the pauses.

• "Two decks. One each. The only rule is that you copy me exactly — no improvising."
• (Both shuffle, then swap.) "Now you have my deck and I have yours. Neither of us has any idea what's in the one we're holding."
• "Take a card. Look at it. Put it back on top and cut. Same as me — see, we're just two people making free choices."
• (Swap back, both search.) "Your card. My card. Two decks, fifty-two chances each." (Turn both over.) "...Explain that one."

Performance tips

• Give instructions one at a time and wait for them to finish before you move on — a spectator out of step ruins the mirror.
• Insist on cuts, never shuffles, once the cards go back on top.
• Search your deck slowly and let them finish first if possible.
• Never touch their chosen card before the reveal; keeping your hands off it is your best proof.
• Play it as astonished coincidence, not triumph. 'How did we do that?' beats 'look what I did.'

Common mistakes

• Glimpsing the bottom card of the wrong deck — the one you receive rather than the one you give away.

  Fix: Fix the rule in your head: glimpse the deck that is about to leave your hands, because that is where their card will end up.

• Bothering to remember your own selection and getting confused at the finish.

  Fix: Deliberately don't look at your own card. Pull one out, glance at it blankly, and put it back.

• Letting the spectator shuffle after placing their card on top.

  Fix: Say 'now cut it' clearly and demonstrate the cut yourself at the same moment. Copying you keeps them out of trouble.

• Rushing the swaps so the audience loses track of the fairness rather than the method.

  Fix: Slow the exchanges down and narrate them. You want the fairness memorable and the geometry forgettable.

• Turning your card over first and then theirs.

  Fix: Lay both down, count to three, and flip them together. Simultaneity makes the match feel like fate.