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Sting shouldn't be in the backseat without telling the driver for a few reasons. First, it's not safe. If the driver were to get into an accident, Sting could be seriously injured or killed. Second, it's rude. The driver is probably not expecting a passenger in the backseat, and it could startle or distract him. Finally, it could be uncomfortable for the driver, especially if he's not used to having someone in the backseat.
