Middletown, especially its first act, is one of the best things that’s happened to Seattle theater in years: deadpan wit synthesized with emotional pyrotechnics as small-town people actually say what most of us can barely articulate, even to ourselves. Will Eno’s play is a loose riff on Thornton Wilder’s Our Town, but seen through the eyes of an astronaut, a cheerfully morbid librarian, a confused young housewife, a drunk mechanic, a poetically minded but brutal cop, and others. Go, go, go. (ACT Theatre, 700 Union St, acttheatre.org, 2 pm, $44)