Nate Campbell wins if for sheer stupidity. For pure comedy value it's that guy that can't get in and out the ring
Vivian Harris dropped his guard against somebody so that he could take the left hook - then got KTFO. It was so bad that when he asked what happened - and they told him - he stated "I was never Knockout!" That's one of the craziest and dumbest things I've seen. I also remember a kids getting KTFO on FNF. When the bell rung - the fighters met in the middle of the ring. One of the Fighters stuck out his glove in a friendly gesture and the other guy caught him with a Left Hook and knocked him out. That was crazy. Another fight on FNF - where one guy lost and punched the other guy with his bare fist, as the winner went to shake the losers hand.
someguy kissed his opponent during the face off before the fight started, and the latter sucker punched him! that was hilarious!