"In karate," they say, "a strong grip is essential [. . . ] The man who has strengthened his grip to the maximum in this way is easily capable of ripping the flesh of his adversary into strips."
What Nonsense! One day such a man came into my dōjō and offered and offered to teach me the secret of ripping flesh into strips. I begged him to demonstrate on me but burst into laughter when, at last, he succeeded in pinching my skin a bit without even causing a single black-and-blue.
- Gichin Funakoshi, "Karate-dō: My Way of Life"
At least he tried it on the generally pacifistic Funakoshi Gichin. Still, it struck me as a good example of how a Delusion can get you in trouble. Perhaps the practitioner didn't really believe his own b.s., but if he was willing to give it a go on a master instructor, he probably did.