Sometimes the way to get a person’s attention and warn them away from running afoul is to advise them in advance that they will be severely punished. If you are dually warned that your bad behavior or poor choices will be met with punishment both swift and harsh, you may think twice about your actions.
With that in mind, I thought this was a very good warning.
On Plantation Key, there is a little fish stand called Craig’s. Over the bar a similar sign warns that unattended children will be sold as CHUM.