Possible Clues:

• When Lady Macbeth cries 'Out, damn'd spot!'
• Last part of 'Hamlet'
• When Romeo dies
• Last part of ''Hamlet''
• When the Montagues and Capulets reconcile
• When Richard III dies
• The ultimate in Elizabethan theatre
• End of 'Macbeth' or 'Othello'
• When Hamlet says 'Alas, poor Yorick! I knew him, Horatio'
• When Romeo drinks poison, in "Romeo and Juliet"