An elderly man went to Stop and Shop in Meriden Thursday evening, but forgot to stop.
After hitting a parked car in the store parking lot, he jumped a curb and came to a stop in the produce section, police said.
"It sounded like a bomb went off," said Gary Harris, who was inside the store when the crash happened. "The whole building shook."
Police officers and firefighters responded to the scene and six people were treated for minor injuries: the driver of the car, two people inside the parked car, two people inside the store and one bystander who was hit by a hubcap.
"Very lucky that nobody was seriously injured or killed," Sgt. Peter Owen, of the Meriden Police Department, said.
During the entire ordeal, the store remained open with customers going in and out of the store only to see a car parked inside. The store suffered significant damage.
"My wife was about to get out of the car and she saw the car. She said, 'Don't, don't, don't," said Baulino Badino, the man who's car was hit.
Police do not know how fast the car was going, but witnesses reported to them that it was traveling around 35 miles per hour.
Stop and Shop has provided police with surveillance video. The cause of crash remains under investigation.