The car-smashing began Friday afternoon when Russell Kerr was pulling out of his parking space at the Piggly Wiggly in Mayville.
"His foot got stuck on the accelerator, and from that point, he panicked and lost control of his vehicle," Mayville Police Chief Christopher MacNeill told the station.
In less than a minute, the 92-year-old's minivan struck nine cars, knocking the entire font bumper off of one. Two of the cars struck were occupied but miraculously no one was hurt, MacNeill said.
"I can tell you in 23 years of law enforcement, I've never seen anything like this," he told WISN-TV.
Police did not cite Kerr because the incident was an accident and not a medical emergency. They also can't take away his license. However, they did notify the state Department of Motor Vehicles so it can determine if the elderly man needs to be retested to retain his license.
Some owners whose cars were hit expressed gratitude the situation did not turn deadly despite the damage.
"What are you going to do? There isn't much you can say. It just happens," Donald Gourlie, whose car suffered $2,400 worth of damage, told the station. "I was just glad no one got hurt."