work at a gas station, and seen that shit happen alot.
when you drive off with it, the hose connection from the top of the pump just disconnects. its made so no gas leaks.
they get ur License Plate
number and other info just incase if they find out that you really made a damage, cz sometimes it doesnt break. they also sometimes get broken but they can fix it themselves, but if they cant fix it they end up buying a new one which will cost you about 70$ probably