14. LeBron James
Even King James loses his temper sometimes. The NBA icon played the Warriors for the championship, but Golden State was too much for the Cavs to handle. It didn’t help that a self-inflicted injury had affected Cleveland’s best player. After the first game, an angry James strode into the locker room and punched a whiteboard (via SBNation). But this was a terrible decision.

The moment of madness left him with a broken hand. He continued to play through the series but the injury compromised him. After two MRIs, it was clear that James broke his hand. However, he didn’t require surgery. He kept his hand in a soft cast and didn’t disclose his malady to the media. It just goes to show that anger can make anyone do stupid things.