Really, what kind of fool would piss off the Shaolin monks?
Shaolin Temple, in the northern province of Henan, became famous in the West as the training ground for Kwai Chang “Grasshopper” Caine in the 1970s “Kung Fu” TV series.
Ninjas – professional assassins trained in martial arts – date back to mediaeval Japan.
via BoingBoing, who also point us to realultimatepower.net, for all your Ninja needs.