The best comedy is rooted in tragedy.

Francis Veber's wonderfully sensitive French farce, The Closet, is a masterful comic romp.
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In these days of political correctness, is it possible to base a comedy on the idea of a straight man pretending he is gay?

Yes, indeed -- but it helps a lot to get a filmmmaker like Francis Veber (The Dinner Game) to write and direct.
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