A teenager has been arrested for disorderly behaviour at a McDonald's in Adelaide's CBD, the second incident at a South Australian outlet this week.
In a video posted on social media, a young woman can be seen behind the counter of a McDonald's, yelling at staff.
A bottle of water can be seen on the floor and chips are strewn across the counter.
The woman walks through the McDonald's kitchen and makes herself a burger and takes a bottle of water.
Two young staff members follow the woman around the store, one of whom is crying and filming, while the other is speaking on a phone.
Two police officers then arrive and escort the woman out into the restaurant's dining room.
Police said they were called to McDonald's on Hindley Street in Adelaide's CBD about 10:30pm on Thursday after reports of a woman acting in a disorderly manner.
They said a 19-year-old woman from Adelaide's northern suburbs was arrested and charged with disorderly behaviour, property damage and assault.
Police will allege the woman damaged a door and threw a bottle of water at staff.
She has been bailed to appear in the Adelaide Magistrates Court in March.
It is the second incident at an Adelaide McDonald's this week, after a 20-year-old staff member was assaulted at the Melrose Park outlet.
And it follows a separate incident at the Hindley Street McDonald's last October, where a worker was spat at and verbally abused.
In September this year, South Australia introduced harsher penalties for people who assault retail workers.
In a statement, McDonald's Australia said "anti-social behaviour is not tolerated in our restaurants and we expect our people to be treated with respect at all times".
The retail workers' union said there had been an increase in disorderly behaviour during the festive season and called for South Australians to stay calm when dealing with people who are just doing their job.
Shop Distributive and Allied Employees Association (SDA) spokesperson Jordan Mumford said the number of incidents was "extremely concerning".
"We're seeing an absolute surge in this kind of behaviour throughout fast-food establishments and this is just another one to add to the list of these kind of instances that we're seeing all over the place at the moment," he said.
Mr Mumford said more action was needed to ensure workers' safety at fast-food outlets along the busy Hindley Street strip.
"We know this is a busy thoroughfare, with often drunken and disorderly customers coming through," he said.
"We're seeing far too many of these instances occur."
