5. BJ Penn
Penn was once on top of the MMA world. The former UFC lightweight and welterweight champion was brilliant in the early days of his career. However, those memories feel like a long time ago now. Penn has been involved in multiple unsavory incidents and is currently dealing with a custody battle for his children.

After his most recent barfight, his chances are looking slim. Penn got into a scrap with a shirtless dude outside a bar on Hawaii’s main island. ‘The Prodigy’ ate a huge left hook and was knocked out. Later, footage showed Penn choking the same guy. As a result, UFC President Dana White said the Hawaiian would never fight for the promotion again.