A Florida woman started a flurry over a McFlurry ... and set her boyfriend's car on fire.

Seems the couple began arguing inside McDonald's when the man refused to order a McFlurry for her. The onlooker said that the woman, whose name was not released, grabbed her companion's keys and said, "I'm going to blow it up."

She ran out to the parking lot, grabbed a can of gas out of the trunk and set the 1994 Cadillac ablaze before running off. The man waited until firefighters extinguished the flames, then drove off – but abandoned the vehicle a short distance away. (WTEV)