Secret 2: The torn banknote
Some time ago, people wondered how David Copperfield managed to seemingly tear a folded dollar in half right in front of people, then unfold it to reveal that it had been completely undamaged. The secret here is making cunning use of a pencil: the latter has been cut in half diagonally and connected with strong magnets! This allows the banknote to be easily passed between the two magnetised halves and remain undamaged.