In one of the great movies of all time, Bambi, one of the great screen characters of all time is reminded by his mother of something that my own mother often called to mind. That would be Thumper, and when he gets a little out of line, his mom asks, What would your father say?
Thumper squinches up and declares, "If you can't say somethin' nice, don't say nothin' at all."