Irish playwright Enda Walsh burst on the theater scene with his 1997 one-act two-hander “Disco Pigs,” which now enjoys a propulsive revival at Off Broadway’s Irish Repertory Theatre.

Evanna Lynch (Luna Lovegood of the “Harry Potter” films) and Colin Campbell, reprising their roles from a London production last year, play two 17-year-olds who were born on the same day in the same hospital in the Irish city of Cork — and who have grown up together as quasi-twins.

The pair share private nicknames — Lynch is Runt and Campbell is Pig — and have spent so much time together that they finish each other’s sentences, often in a kind of private language that suggests Walsh read Anthony Burgess’ “A Clockwork Orange” an awful lot as a young man.

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