I don't know how many of you recall, but there was a time back during either the eighties or nineties then there was a cone on the nozzle. It was an earlier generation of the vapor recovery type gas handles.
You had to force the nozzle in until the cone caught on the inside of the end of the gas filler tube to create a seal so the vapors wouldn't escape. It was a real PITA with the Cuda's to get it in because of the license plate in the way.
One day I wrestled mine in a little too hard trying to get it to seal so it would stop clicking off and broke the whole end off right inside the gas tank.
I left it in till I took the car apart. The owner was pissed that day.