You can learn a lot in petrol stations.
I was witness to this recently: a woman goes to pay and the employee says that it appears someone was putting petrol in the tank (very strange) or that the woman hadn’t put the nozzle back in its place properly. The woman says that yes, she had put the nozzle back. She insisted she had.
In the end she goes to have a look. When she comes back she says: “Well, yeah, actually …um.. the nozzle wasn´t .. you know .. right.”
The effort she made to avoid taking responsibility made me smile to myself.