16. Anderson Silva’s Downfall
Anderson Silva was the greatest MMA fighter on the planet from 2006-2012. Then he ran into Chris Weidman. The pair first met at UFC 162 in Las Vegas and Silva finally lost his middleweight crown. The Brazilian had defended his title an incredible 10 times before this but got overconfident against the American. He dropped his hands and showboated. That was all good until Weidman knocked him out cold.
It was an immensely embarrassing moment for Silva but it also severely impacted the remainder of his career. He fought Weidman again in an immediate rematch, but this time suffered a freak leg break. Then he won just one of his last seven fights with the promotion. If he had taken the first Weidman fight seriously, it’s highly like this career trajectory would have been very different indeed. In short, keep your hands up.