David DeVal's miniature illusion: A box and a knife can be examined closely. Then you stick your finger through the box and pierce both with the knife.
Looks crazy.
Even astonished Wolfgang Sommer, the president of the Magic Circle.

• No need for a knife, as almost any knife will do. • No trick finger or anything like that. • Nothing to add or remove. • Can be examined before and after the demonstration!
• If you like the bizarre, there can also be (theatrical) blood flow!