Possible Clues:

• ''Stop acting up!''
• Be in control of performance with good manners
• Just be good if you want to be in possession of this
• Nanny's cry
• Mind your manners
• Be good and be in possession
• Act in a certain manner
• Be good to be this and be in possession of it
• Conduct oneself (properly)
• "Oh, ---!" (Austin Powers' line)