You drove and pulled up to the gas station to fill your gas tank. You exited your vehicle, opened your gas tank cover, grabbed and put the dispenser nozzle in. You also had to pay at some point.
How can you forget that the hose is still connected to your car when you drive off?
Yeah cameras, but also pay at pump systems that preauthorise a card payment then dispense the fuel, then charge whatever it cost (after the pump is placed back in the holder).