One of the first counter-arguments as to why MMA is safer than boxing usually involves the fact that there are no standing-eight counts in MMA. But what happens when a guy doesn't get knocked down or finished?
Usually, the result is a ton of brain damage to go along with some speech impediments.
For the guys on this list, it's a miracle that they're still functioning, let alone some of them still competing in MMA today. They emphasize the phrase, "take a lickin' and keep on tickin'."
There are number of guys who could be on this list and I'm sure the comments section will be littered with suggestions as to who should be on and who should be taken off.
The fighters on this list may not have achieved great success in their MMA careers but they're unquestionably worthy of one title, "the toughest man in MMA."