"one"
"It should only take ONE 'stop,' to get you to stop. You shouldn't have to be told repeatedly to stop what you are doing."
I like that.
Yes, we should always obey every single rule made by every single authority. It is always wrong to break the rule. Regardless how ridiculous or ad hoc it seems, no rule can be challenged. We must embed this idea in our children at all costs. </sarcasm>