Apparently, if you are a boxer, ears aren't too tough.
When I was a kid, one of the school bullies and I got into a fight, and while he was on top of me he made the mistake of having his flank near my mouth, so I bit REALLY hard. He came off me like he had a rocket up his ass. He was super pissed, but didn't want anything more to do with me.
The next day he came up to me and my thought was "Aw, shit, here we go again". But he didn't want to fight, he said "You little fucker, look what you did to me!" He pulled up his shirt, and there was a huge nasty looking purple bruise about 5-6 inches across with my dental imprint right in the middle...right above his hip on his flank. He never did mess with me again, and in fact, sort of steered away from me. I guess crazy works in a fight.