Staff at KFC's Hindley St store in the Adelaide CBD normally expect to take an order of burgers and fries.
Instead, they copped a hot and spicy serve from a young woman who verbally abused them and hurled equipment over the counter.
Her foul-mouthed zinger, which unfolded in front of customers about 9.30pm on Friday, was captured on video and uploaded to social media.
During the outburst, the woman picked up various items on the service counter, including EFTPOS machines and a receipt printer, and hurled them across the store, news.com.au reported.
One of the machines hit and damaged a menu screen.
The Magill woman, 20, was charged with disorderly behaviour, property damage, two counts of assault and two aggravated counts of assaulting police. She was bailed to appear in court at later date.
The woman, who the Sunday Mail has chosen not to name, lamented her violent rampage in a post on her Facebook page yesterday. She wrote that it was "time for me to get my life in check", "stop drinking" and that she "can't go on like this any more".
"Alcohol is a drug and its (sic) time for me to make a change and go back to the gentle girl that was once me," she wrote.
"Life hasnt (sic) been an easy one and we all make mistakes nows (sic) my opportunity to turn it around and make the best life and best me I can."
Andrew Moschakis, who recorded the video, said the woman was trying to pay for her order via bank transfer because she did not have any cash or a card.
"Then she got very aggravated and started screaming and yelling," he said.
After the video stopped, Mr Moschakis said the woman grabbed a 24-pack of 7Up cans sitting on the service counter and threw it towards the back of the store.
"Then two guys came, they said they were from the store across the road, they both pinned her down until four to five police on horses came and put her in cuffs," he said.
"There was no calming her down. She was psychotic."
The video was sent to the ShitAdelaide Instagram account and has been viewed more than 50,000 times since being posted.
Shop, Distributive and Allied Employees Association – the union representing workers in fast-food industry – assistant secretary Josh Peak said it had contacted KFC after the "outrageous incident" to ensure appropriate action was taken.
"Staff went to the back of the outlet and police were called," he said.
"The union has ongoing concerns about the safety of fast-food workers on Hindley St and has expressed that adequate policing and security are present within the street.
"The union has had enough of workers being threatened this way in fast-food outlets on Hindley St and wants to send a clear message to the community that this behaviour is not tolerated." The Sunday Mail understands a security guard is usually employed at the store from 11pm at weekends.
A KFC spokesman said management was relieved that no one was injured.