Surveillance video caught the extremely ugly moment when Conor McGregor sucker punched an old man.
The incident occurred on April 6 at The Marble Arch Pub in Dublin, according to TMZ. The dispute appears to start over shots of McGregor's Proper Twelve whiskey.
In the video, the MMA fighter can be seen lining up cups to pour shots of his whiskey for bar patrons. He puts one in front of an older man at the bar, but he appears to refuse it.
Things escalate quickly, and McGregor is then seen socking the man with a left hook to the side of his face.
He's then quickly pulled out of the bar by two men. TMZ reports that police are aware of the incident, but no charges were ever filed.