A man was shot dead in his car. The doors are closed, and locked. The windows are up. The keys are in the ignition. It's clear from the fragmentation around the bullet hole in the front windshield that the shot came from the inside of the car.
On inspection of the crime scene it quickly becomes apparent that the killer neither opened nor closed any of the doors or windows. As the killer is no longer in the car, one question remains.
How did the killer exit the car?