He shot the car and then the driver, with the pellet lodging in tissue just beneath the victim's eye.
Police said the victim was in hospital in a stable condition and would undergo surgery to remove the pellet.
The shooter is described as a white male with light or ginger hair, and was heard to laugh as they drove off.
Anyone who may have witnessed the incident or saw similar behaviour around this time and location is urged to contact Detective Sergeant Steven Pivac at North Shore Police on 09 477 5000, or anonymously to Crimestoppers on 0800 555 111.