An examined mirror bends in half despite being in view at all times
A mirror is removed from its frame and examined. It is inserted back into the frame and everything is inserted into a paper envelope. The mirror is always in view via two cutout windows in the envelope. A sword is passed through the mirror penetrating it and finally the mirror is bent completely in half. The mirror is removed and fully examined again. It is comlpetely solid.
A classic effect with a brand new method.
"Bloody brilliant! I haven't got a clue!"