BJ Penn licking opponents blood after several fights: Matt Hughes, Sean Sherk, Joe Stevenson and Diego Sanchez. Crazy.
pff that was all awesome.
I can see that being viewed as disrespectful, all though in my opinion it's just more gross!!
Every example given so far would have to be considered a top contender. To a certain degree, it's hard not to simply say Hammerlock posted to two best, it's not often people are so low that they continue to attack after the fight.
On a business level it's Brock Lesnar though, without question.