A Japanese Shogun is looking for a new Samurai
He summons three swordsmen, one of them Jewish, to his palace to showcase their skills.
The first swordsman stands before the shogun with a sword and a small box. When he opens the box, a small box. When he opens the box, a fly flies out. With one swing of his sword, the fly is dead.
The second swordsman again brings a sword and a small box. When he opens the box, an even smaller fly comes out, and he kills it with one swing. The shogun is impressed.
At last, the Jewish swordsman walks up. He is also carrying a sword and a small box. He opens the box and an even smaller fly comes out. He swings his sword around many times, but it doesn't seem to affect the fly.
"I am disappointed," says the shogun. "You didn't kill the fly."
The Jew replies, "A circumcision is not meant to kill."