There is a beautiful myrtle tree in Tao Yuan Park (Yellow Mountain). "It is the Monkey Slippery Tree," the gardener explained. "The trunk is so smooth. It is hard even for monkeys to climb." The gardener then scratched the armpit of a twig. The twig shook all the way up to the tips of the leaves. "It is a tree for a man who is afraid of his wife," he concluded.
How about rattan whipping? How about kneeling on top of abacus? There are a few methods of punishment much more severe than scratching armpits.