cue the "Jewish samurai" joke here.....
eta: OK, OK, since you insist....
The Emperor is hiring new bushi (samurai). Naturally an important part of the interview process is demonstrating prowess with a blade.
First candidate enters the throne room. A housefly is buzzing around. Snick! Snick! The fly drops dead, in three pieces.
Next candidate enters. Another housefly. Snick! Snick! Snick! Snick! That fly drops in five pieces.
Third candidate enters -- the Jewish one. You guessed it, another housefly. Snick! Snick! And the housefly buzzes away and out the window.
Emperor: "But you didn't do anything to the fly!"
Candidate: "Ah, Your Highest Excellency -- killing a fly, that's easy. Doing a bris, now that's hard!"