Benzinga and Yahoo Finance LLC may earn commission or revenue on some items through the links below. Actor and comedian Kevin Hart may be one of Hollywood's sharpest business minds today, but even he admits that not every investment was a winner. Kevin Hart Calls This Investment His Biggest Business Mistake In a 2022 appearance on The Late Late Show with James Corden, the 46-year-old star revealed that his worst business decision came from putting money into his friends' ventures. "The worst business inv ...