When the applause has died down a little, the magician strides over to another box similar to the one from which you have just escaped, except in that it is upright. 'You will remember, ladies and gentlemen,' says the magician to his audience, 'that earlier in the show I locked my glamorous assistant Donald in this perfectly ordinary wooden box.' The audience begin to bark perhaps in agreement, or perhaps because they want more fish.

When the magician opens the box, however, it is completely empty! 'You will observe,' continues the conjourer, 'that the lovely Donald has entirely disappeared!' The seals are too flabbergasted to clap.

Will you demand to know what he has done with Donald, or wait to see what he does next?