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Measure for Measure, by William ShakespeareRead about another title on the list.
The Duke who governs Vienna wants to see what his underlings will get up to in his absence. So he asks his friend Friar Thomas for some monkish garb: "Supply me with the habit and instruct me / How I may formally in person bear me / Like a true friar". It works, and not even his most devoted courtiers recognise him until he finally unveils himself.
--Marshal Zeringue