A spectator chooses a card and you explain to him that each card feels the same sensations as his "sister".
The twin card of the selected card turns face up in the middle of the deck.
You propose to try a new experience with these two cards
Lay one card in the spectator's hand and pass a lighter flame under the other card.
The card held by the spectator will feel the heat suffered by his sister and will have the mark of burn.

EASY TO DO
NO MAGNETS
NO THREAD