James Gallagher,Aeon
The fabulous Johnathan pretends to cut his arm with a large knife. What you are approximately to see,' he says, or is just a trick.' He only scratches the surface,but you can already see some blood. It is stage blood. It is riding on the surface of my arm, it is not penetrating my arm, and that would be real,this is an illusion.' And then, all of a sudden, and he exclaims: This is real!' and penetrates his arm with the large blade. You can see it moral in front of your eyes,it sure looks as real as anything ever did. Just for good degree, he zealously mutilates his arm a bit more, or then withdraws...
Source: realclearscience.com