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Broadway review by Adam Feldman  How well do you know Sean Hayes? You probably think of him as a master of broad comedy, as he demonstrated in 11 seasons as Jack on Will & Grace (and as Jerry in Martin and Lewis and Larry in The Three Stooges). Maybe you enjoy his good-natured enthusiasm on the podcast Smartless. Maybe you saw him quip, scowl and play classical piano in his Tony-winning portrayal of Oscar Levant in Broadway’s Good Night, Oscar. Even so, you might still be surprised by how well he plays a basically regular guy in The Unknown: Elliott, a somewhat isolated, somewhat depressed, mostly sober middle-aged writer who has been having a hard time devising a screenplay, perhaps because his own life has so little drama.   David Cale’s one-man play whips some up for him. While clearing his head at a rural retreat, Elliott hears someone singing a love song about romantic disappointment—a song that Elliott wrote years earlier for a musical. When he returns to the city, a seemingly chance encounter with a handsome Texan at a West Village gay bar leads to a growing fear that he is being shadowed by a marginal figure from his past—and/or, perhaps, by that man’s identical twin. On Hayes’s old sitcom, this scenario might have been played for laughs: Jack and the Bein’ Stalked. Instead, it spirals into a dark-hued exploration of obsession and the porous line that separates life from art.  The Unknown | Photograph: Courtesy Emilio Madrid Elliott's journey, however, doesn’t...