Video recorded by the next person in the drive-thru line shows the two women climbing in the window at about 2:30 a.m.
"I was like, 'This can't be happening in front of me right now, '" said Monique McNeely, who witnessed the incident.
He printed out a receipt to show the pair that they had only asked for four and told them that they would have to drive around once again if they wanted to place a new order.
Ms McNeely said she had to hide her face from the attackers, out of fear that they'd come for her next - but while she's pretty sure they saw her, they just got back into their vehicle and sped off. "There was a point where I knew they saw me, but then they just got back in their auto and drove off".
He said the women pulled up to the second window of the drive-thru and said they hadn't been given all of the nuggets they ordered.
McNeely and her daughter were in IN for a band competition, and she says that at some moments, she was a bit afraid, telling the Star, "I was anxious that they were going to see me".
"I couldn't even imagine being one of the workers and seeing somebody coming into that window like that".
According to RTV6 the manager told the women to "have a nice day" before turning his back on them to fulfill other customer orders.
McNeely said she had no idea what the fight was about at the time and couldn't believe it was over chicken nuggets. Police said the two women damaged the register and spilled tea onto the floor.
Police are looking over video of the incident.
Managers at the store declined to comment, but some people in the area said they were not surprised about the altercation.