The UFC where tank lost to Belfort was UFC 13. He didn't get ko'd, it was a ref stoppage. If you really want to see tank getting ko'd, get Ultimate Brazil. He gets the shit knocked out of him by Pedro Rizzo.
Fighting is for the weak. I would recommand all of you taking Tai Chi, and relaxing your souls. Martial Arts was not meant for fighting, it was meant for re-discoverying who you are and why you are here in this wierd world.