Miami's late Randy Eugene should be number 1. He ate his face off!
http://m.huffpost.com/us/entry/1552249/The guy was, like, tearing him to pieces with his mouth, so I told him, 'Get off!'" Larry Vega told WSVN. "The guy just kept eating the other guy away, like, ripping his skin."
But Vega said when the police officer yelled at Eugene to back away, the naked man merely raised his head "with pieces of flesh in his mouth," growled, and began chewing again.
I was in a beer league hockey game once and got in a fight. Guy got me in a headlock and I couldnt breathe. The ref's were not breaking it up. I bit him on his stomach to release me. Heat of the moment thing. Kinda understand this soccer guys actions somewhat. Though he wasnt in the same situation.