Possible Clues:

• When Iago acquires Desdemona's handkerchief
• End of some plays
• Part of many plays, but not 'Waiting for Godot'
• When Banquo dies in 'Macbeth'
• Last part of many plays
• When Shylock says, 'If you prick us, do we not bleed?' in 'The Merchant of Venice'
• When Hamlet gives his 'To be, or not to be' soliloquy
• ''Tosca'' conclusion
• Play ender, often