A hilarious comedy routine! Messy, messy, messy- and the kids love it!
Explain that you just received a new trick in the mail, but have not had time to practice it or even read the instructions. Bring out a shipping box, and open it, taking out a CD and a real banana. Put the CD in a player, and following the spoken instructions that you are apparently hearing for the first time, proceed to perform the Vanishing Bandanna trick.
Oops! Too late, you realize that the box contained a BANANA, not a bandanna. But you bravely go on with the trick anyway, following the increasingly hilarious (and messy!) instructions.
Amazingly, at the end of the trick, you do indeed vanish the banana, and make it reappear, fully restored, in the previously empty shipping box. Your audience will be rolling in the aisles!