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#4. BJ Penn
The new generation of UFC fans might be unaware of just how impressive BJ Penn was in his prime. A legendary fighter who was once considered the greatest lightweight of all time, Penn was an exceptionally skilled mixed martial artist.
His willingness to tackle any challenge endeared him to fight fans around the world as he twice faced the larger Georges St-Pierre and even locked horns with future light heavyweight champion Lyoto Machida.
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Sadly, those who did not see Penn fight know him only for his legal troubles. In the Hawaiian's final years with the UFC, he was involved in multiple violent incidents, sparking brawls and even assaulting his estranged girlfriend.
Following his release from the UFC, Penn faced a paternity lawsuit from the mother of one of his children, adding to his long list of legal struggles.
A year later, he was arrested on DUI charges, with video evidence showing an intoxicated Penn insulting the officers involved in his arrest.
#3. Thiago Silva
Most fight fans would be hard-pressed to find anything notable they remember about Thiago Silva's UFC career, other than Silva earning Lyoto Machida a title fight by being the recipient of a Machida knockout blow.
However, prior to Thiago Silva's release from the promotion, he was a central figure in a shocking situation involving his then estranged wife Thaysa Kamiji.
After violating an order of protection that Kamiji had secured against him, Silva turned up at Pablo Popovitch's gym. At the time, Kamiji and Popovitch had started dating after the dissolution of her marriage to Silva. Armed with a handgun, Silva threatened both Kamiji and Popovitch before ultimately being arrested on multiple charges of assault.
In the aftermath of the incident, the UFC opted against re-signing him, although several attempts were made before video evidence emerged to further paint Silva in a poorer light, even highlighting a possible cocaine addiction.
The Brazilian has not fought in the UFC since and despite his run in other MMA promotions, the most visibility he's ever received is from his troubles with the law.
