The Sawing a Woman in Half illusion using clear boxes that
The Twins performed on fellow guest
Darcey Bussell is called Clearly Impossible. Although The Twins claimed in their introduction that it was the first time it had been performed using clear boxes to cover the assistant while she was being sawed in half, the illusion was actually invented and performed in the early 1990s by magician
Jonathan Pendragon, and has been performed by many other magicians since then.