A driver saw red and attacked a traffic warden as he was about to slap a parking ticket on his car.
Daniel Corneille pushed Gareth Lawrence so hard into a restaurant window, he fractured his shoulder.
Maidstone Crown Court heard the victim was about to issue the ticket in Sheerness High Street on January 6, when Corneille, 46, approached shouting: “Oi fat boy, what do you think you’re doing?”
Prosecutor Ian Foinette said Corneille, who has previously been jailed for wounding with intent, protested - despite being parked on double yellow lines.
He pushed Mr Lawrence forcefully into the window of an Indian restaurant. The attack was captured on the victim’s body-camera and CCTV cameras.
Corneille, of Chequers Road, Sheerness, drove off afterwards. When arrested, he made full admissions.
Mr Foinette said Mr Lawrence was left unable to help his wife with their children or do domestic chores.
“He now has apprehension about being attacked again,” he added.
Corneille admitted inflicting grievous bodily harm but appeared in court without a lawyer because of legal aid difficulties.
Recorder Brian Argyle adjourned sentence for reports to consider dangerousness after hearing that Corneille was jailed for six and a half years in March 2010 for knifing a man in a revenge attack on behalf of a friend.
Corneille, who had been living in Queensway, Sheerness, had been drinking in Minster pubs before going to the home of victim Lee Edmunds.
He stabbed Mr Edmunds in the legs and arms and punctured his chest with a kitchen knife after telling him: “This is for Dean.”
Afterwards, he added: “If you grass me up I’ll come back and cut your throat.”
He was acquitted in October 2009 with another man of wounding after a man was “beaten to pulp” and needed 30 stitches in head injuries in a Minster pub.
Granting bail until sentence on November 6 and advising Corneille to obtain legal representation, Recorder Argyle said: “This is a very serious matter of assault on a public servant you are facing.
"You must expect a substantial custodial sentence.”
He warned Corneille he could be facing an extended sentence.