UFC star Junior dos Santos -- a former heavyweight champ -- claims he's been FALSELY identified as the violent maniac who knocked out several people in a nightclub rampage ... and he's pissed.
The video is insane -- showing a muscular dude dancing in a club on August 19th before another patron accidentally bumps into him. That's when it all goes to hell.
The man in the video explodes -- throwing haymakers at EVERYONE and sleeping dudes left and right. One of the men was knocked out cold and looked to be seriously injured.