Thugs chucked a drink at restaurant staff, stole a charity tin and threw a traffic cone across a KFC in Northampton town centre, police have said.
Officer are appealing for information following the robbery and attack inside the fast-food chicken outlet in Abington Street, last Friday, between 10.30pm and 11pm.
Four men entered the restaurant and placed a food order.
Two of them began to argue with staff about their food, however, they became aggressive and abusive and threw a drink at staff.
Both men then climbed over the counter and went into the kitchen where they assaulted a member of staff.
The staff member ran out of the restaurant and was initially followed by the men, who then returned to the restaurant, climbed back over the counter and demanded money.
A charity tin was then stolen from the till and one of the men threw a traffic cone across the restaurant.
One of the men was described as white, aged 20 to 25, 5ft 6in to 5ft 8in and of slim build.
He had short blond hair and was wearing a white t-shirt, trousers and had a large black tattoo on his left forearm.