A man suffered a broken jaw when he was attacked after buying two women a drink in a Carlisle club.
The 27-year-old was in the Las Vegas Strip nightclub on Tuesday night with friends when he was assaulted.
He had just bought the drinks and was attacked by a male friend of the women, Cumbria Police said.
The victim, who is from Southampton, was taken to the Cumberland Infirmary where he needed surgery. Police are appealing for witnesses.