Kimbo needs to go back to fighting helpless fat guys. What a hack. I'm not even sure what happened. Kimbo didn't shoot, he was throwing a right and just stiffened up and fell over mid-punch. It sort of looks like Petruzelli caught him with a little bit knee and a little bit of right hand at the exact same time. Watch the fight again, but just watch Kimbo. He didn't shoot, he didn't slip, he just fell
YouTube - Kimbo Slice Vs Seth Petruzelli EliteXC
It doesn't add up though because Kimbo is an absolute rock head. Unless the knee hit harder than it appeared to, or the right hit him directly in the temple, I'm at a loss.