In my experience considerable amounts of sighing and the occasional audible 'tut' should do the trick. Other than that, I don't think there's much else you can do. Other than getting ready to repaint the ceiling. Again.
@Brommers started
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In my experience considerable amounts of sighing and the occasional audible 'tut' should do the trick. Other than that, I don't think there's much else you can do. Other than getting ready to repaint the ceiling. Again.