The above clip from an old episode of The George Michael Sports Machine (R.I.P.) shows Herschel Walker calling out heavyweight boxing champ Mike Tyson, for pretty much the same reasons he’s trying MMA these days: Because it’s there, and because he’s a little bit nuts. Dissociative Identity Disorder aside, Walker is one of the most eccentric characters in pro sports. While plugging his upcoming Strikeforce: Miami fight against Greg Nagy during an appearance on the Howard Stern Show yesterday morning, Walker revealed the following:

— For over 20 years, he’s only been eating one meal a day, which he takes at night. He doesn’t eat meat, which is ironic because he owns a very successful chicken-distribution company.

— He sleeps three or four hours a night.

— He has played Russian Roulette over six times; he thought of it as a "competition."

— He doesn’t remember winning the Heisman Trophy in 1982.

Still, there are times when Walker seems remarkably lucid. In the interview below, Walker stresses the importance of getting into a good training camp and taking preparation seriously so that he doesn’t embarrass the sport like Jose Canseco and Johnnie Morton did. He shouts out Cain Velasquez and Josh Thomson as inspirations. He knows not to leave fights in the hands of the judges. In other words, he sounds like he knows what he’s talking about. At least in Walker’s mind, this is not a publicity stunt — he’s passionate about MMA, and serious about giving it a try now that he’s got some free time. Is he crazy enough to pull it off?