there sure have but there have been a few ULTRA RIDICULOUSLY TOUGH guys like the 3 guys on the OP if you can add to that selelct list, then, go for it....
Shannon Briggs. The hammering he took at the hands of Vitali was just insane. Broken left orbital bone. Broken nose and a badly torn left bicep that required surgery. It wouldn't have done his brain much good either. But he just kept coming out for more. Round after round.