According to witnesses, the woman set a man's car on fire in the parking lot of a Jacksonville McDonald's after he refused to buy her a McFlurry on Sunday.
An eyewitness told WFTV the woman poured alcohol and gasoline on the car and then lit it on fire.
Witness Sabryna Maré talked to Action News about what she saw after she was stuck behind the couple in line.
"They were going at it," Maré said. "She was saying she wanted this and wanted that, and she wanted either a McFlurry or an ice cream on top and he was not in for it. Then he was yelling at her saying he's not going to do it."
The car was a 1994 El Dorado.
"Next thing you know, she says 'I'm going to blow it up,' and we were wondering what are you going to blow up?" Maré said. "She got something out of the car that happened to be a bottle and then she got gasoline from who knows where. Then she poured everything all over it and next thing you know there was a match and it was up in flames."
The man and woman have not been identified at this time.