Piston rings rejected, founder returns to school
In the late 1930s Soichiro Honda's first piston rings were rejected by Toyota: of 50 rings inspected, only 3 passed quality standards. Rather than abandon the business, he enrolled at the Hamamatsu technical school to study metallurgy. He attended only the lectures relevant to his problem and skipped the exams, and he said a diploma was worth less than a movie ticket. He eventually produced rings good enough to supply Toyota, then saw his plant bombed in the war and wrecked by an earthquake, and sold what remained to Toyota.