#1 War Machine
No, that's not even his nickname. Born John Koppenhaver, he legally changed his name to War Machine in 2008. Machine has been one of the most despicable human beings on the planet, having been arrested multiple times for getting into altercations and seriously harming people.
The worst case of this is when he attacked ex-girlfriend and adult film star, Christy Mack, at her home resulting in 18 broken bones, a broken nose, missing teeth, a broken rib and a ruptured liver for Mack. She also alleges that War Machine tried to rape her.
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The MMA fighter is now awaiting a hearing to decide his fate and it does not look promising. Inside the cage, though, there was a lot of celebration when he was choked out by Ron Keslar at Bellator 104.
We sincerely hope that we never see this man anywhere near MMA again.