A viral video has captured the moment a man knocked out an intoxicated patron after he allegedly groped his wife at a bar.

Security footage from the scene shows the married couple preparing to play a game of pool. While the husband arranged the balls on the table, a visibly drunk man wearing a red polo shirt and ripped jeans approached the woman from behind and appeared to grab her inappropriately.

The husband, who witnessed the incident, immediately rushed toward the man and landed a heavy overhand punch that sent him crashing to the floor.

Moments after the confrontation, a member of the bar staff stepped in and attempted to calm the situation as other patrons looked on.