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?
It used to be common to pay after in America decades ago. But paying after means you can drive off without paying. Stations calculated the cost of occasionally needing to reattach the hose VS the cost of more frequent theft. This was at the time when card payments at the pump became popular so the cash payer group that’s inconvenienced by the change got smaller anyways.