Enthusiastic cardboard boxes

The magician shows the audience a thin colored box containing another box of a different color. A total of four boxes are nested inside each other. The magician places a white sheet of paper inside the last box and reseals all the boxes, forming a single package. Finally, after a magical gesture, he opens all the boxes again and reveals that the last box contains a real banknote instead of the white sheet.

Other ideas: You can transform a blank playing card into a card chosen by a spectator. A piece of paper turns into a business card. A 2-euro coin becomes a 20-euro note.