Even if you loathe musicals, you should see Gutenberg! The Musical!, a play pretending to be a staged reading (singing?) of a new musical biography of printing-press inventor Johann Gutenberg. The two hilariously clueless playwrights unintentionally skewer every musical cliché, but it's their antic energy as they play a giant cast (including an anti-Semitic young girl who sells flowers she steals from Jews) that makes the play a comic gem. Your face will hurt from laughing too hard. (Erickson Theater Off Broadway, 1524 Harvard Ave, 800-838-3006. 8 pm, $10–$25.)