“Don’t worry about an invoice. You’d have to do things properly then, wouldn’t you.”
I hate this. I hate that the only way out is to give a non-committal answer. I hate that people assume I’m happy to break the law. I hate that people use roads, hospitals, schools, public services and specialists who will rush to your aid 24/7/365, yet don’t have the first clue as to how this happens, or what it’s like elsewhere. But mostly I hate the way they say it.