My statistics professor in college told a story about Cadillac back in the 80's, I have no clue as to the validity. Cadillac had contracted with a Japanese firm to manufacture the radios for the current years production. The contract allowed a couple percent of the radios to fail inspection. All year long, every single radio in every lot worked, until the last lot of the year showed up, none of them worked! The production line was dead in the water.