CCTV pictures have been released showing the moment a man entered a pub brandishing a chainsaw.
Dean Dinnen, 24, had been thrown out of the bar in Hull shortly beforehand for flouting the smoking ban.
He returned with a petrol-powered chainsaw which he started up in front of the terrified onlookers.
Punters managed to restrain him before armed police arrived to arrest him.
Dinnen has since been jailed for three years.