We all know the story of Lady Macbeth
Who was stricken at night with horror of death,
And away from her bed would totter and stagger
With morbid delusions about a big dagger;
While her eyes ran with tears which were scalding and hot
And in accents quite hoarse she would cry ” Out damned spot ”
And above all, which seemed to distress her the most,
She never knew when she’d be seeing a ghost.