An ambulance crashed into a Starbucks early Thursday, causing some building damage and shattering a window at the coffee shop.

The ambulance, operated by Trans-Care Inc., was not on an emergency call at the time and no patients were inside the vehicle. One ambulance worker was inside the shop around 1 a.m., while another waited in the ambulance, Starbucks shift manager Spencer Lloyd said.

The worker in the ambulance dropped several items on the driver's side floor of the vehicle and leaned under the steering wheel to retrieve them. He accidentally knocked the vehicle into gear, causing it to lurch forward into the shop, Lloyd said.

The store in the southern Indianapolis suburb was briefly closed to walk-in customers, but the drive-in window remained open, Lloyd said. Once maintenance crews cleaned up debris and boarded up the shattered window, the store opened to walk-in customers.

"Wear your coats to Starbucks today," Lloyd joked. "It's a little chilly."