In a suburban home, a depressed person is being made worse by the influence of a frilly-dressed French aristocrat from the late 18th/early 19th Century who is miserable himself and reads sad stories, heartbreaking poetry, and lines from tragic plays to our depressed suburban hero character. But then he takes the antidepressant, and the Marquis de Sad starts to fade away, despite his efforts to resist.
And the slogan is: “Banish the Marquis de Sad!”