This is a trick puzzle.
The magician shows the spectator an empty card box, a nail and a card with a hole.
The magician puts the card in the box and pierces it with a nail. The cards are impossible to pull out until the nails are pierced through the box ...
Not true.
The magician unbelievably pulls the card through the nail!
This trick for those who love magic puzzles.
The trick uses only three objects - a nail, a card and a card box. No gimmicks, threads or magnets.