Theranos

Theranos reached a $9 billion valuation on a blood-testing technology that never worked, fooling luminaries like Henry Kissinger and Rupert Murdoch, along with boards of Walgreens and Safeway. This regulatory debacle led to criminal charges after it became clear the devices could only run about 12 tests reliably, far less than the 200+ claimed. The company's failure was more dramatic than Juicero's waste, because Theranos's false promises endangered real patients, not just investors' wallets. Its founder is now serving an 11-year prison sentence.